Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 12 |
| CVE-ID | CVE-2021-23994 CVE-2021-23995 CVE-2021-23996 CVE-2021-23997 CVE-2021-23998 CVE-2021-23999 CVE-2021-24000 CVE-2021-24001 CVE-2021-24002 CVE-2021-29945 CVE-2021-29947 CVE-2021-29946 |
| CWE-ID | CWE-787 CWE-416 CWE-264 CWE-277 CWE-362 CWE-20 CWE-682 CWE-119 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Mozilla Firefox Client/Desktop applications / Web browsers Firefox ESR Client/Desktop applications / Web browsers |
| Vendor | Mozilla |
Security Bulletin
This security bulletin contains information about 12 vulnerabilities.
1) Out-of-bounds write
EUVDB-ID: #VU52333
Risk: High
CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-23994
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input within the WebGL framebuffer. A remote attacker can create a specially crafted web page, trick the victim into opening it using the affected software, trigger out-of-bounds write and execute arbitrary code on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 8.0.1 - 87.0
Firefox ESR: 60.0 - 78.9.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:8.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:60.9.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:68.12.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:78.9.0:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Use-fater-free
EUVDB-ID: #VU52334
Risk: High
CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-23995
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input, when Responsive Design Mode is enabled. A remote attacker can create a specially crafted web page, trick the victim into opening it using the affected software, trigger a use-after-fee error and execute arbitrary code on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 8.0.1 - 87.0
Firefox ESR: 60.0 - 78.9.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:8.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.1:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Security restrictions bypass
EUVDB-ID: #VU52335
Risk: Medium
CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-23996
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to application allows content rendering outside of the webpage's viewport. A remote attacker can utilize 3D CSS in conjunction with JavaScript to spoof contents of a web page.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 87.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:80.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:80.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:81.0:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Use-after-free
EUVDB-ID: #VU52336
Risk: High
CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-23997
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error caused by unexpected data type conversions when freeing fonts from cache. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 87.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:80.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:80.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:81.0:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
5) Insecure Inherited Permissions
EUVDB-ID: #VU52337
Risk: Medium
CVSSv4.0: 4.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-23998
CWE-ID:
CWE-277 - Insecure inherited permissions
Exploit availability: No
Descriptionthe vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to the way HTTP pages inherit a secure lock icon, when navigating from an HTTP page. A remote attacker can create a specially crafted webpage that through a series of complicated navigation will force the browser to display a secure lock icon on an unencrypted HTTP page.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 87.0
Firefox ESR: 60.0 - 78.9.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:60.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.2:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
6) Insecure Inherited Permissions
EUVDB-ID: #VU52338
Risk: Medium
CVSSv4.0: 4.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-23999
CWE-ID:
CWE-277 - Insecure inherited permissions
Exploit availability: No
Descriptionthe vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to the way Firefox handles Blob URLs. If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 87.0
Firefox ESR: 60.0 - 78.9.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:60.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.2:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
7) Race condition
EUVDB-ID: #VU52339
Risk: Medium
CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-24000
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform clickjacking attack.
The vulnerability exists due to a race condition within requestPointerLock() and setTimeout() methods in conjunctions with certain elements, such as <input type="file">. A remote attacker can create a specially crafted web page that will result in a situation where a user interacting with one tab when they believed they were on a separate tab and gain access to sensitive information.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 87.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:80.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:80.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:81.0:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
8) Security restrictions bypass
EUVDB-ID: #VU52340
Risk: Medium
CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-24001
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to application does not properly impose security restrictions to testing infrastructure. A compromised content process could have performed session history manipulations it should not have been able to due to testing infrastructure that was not restricted to testing-only configurations.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 87.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:80.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:80.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:81.0:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
9) Input validation error
EUVDB-ID: #VU52341
Risk: Low
CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-24002
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input when processing newline characters in an FTP URL (such as %0A and %0D). A remote attacker can trick the victim to click on a specially crafted URL and execute arbitrary FTP commands on a remote server, given that victim has access to the FTP server.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 87.0
Firefox ESR: 60.0 - 78.9.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:60.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.2:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
10) Incorrect calculation
EUVDB-ID: #VU52342
Risk: Low
CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-29945
CWE-ID:
CWE-682 - Incorrect Calculation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to crash the application.
The vulnerability exists due to the WebAssembly JIT miscalculates the size of a return type, which leads to a null read. A remote attacker can create a specially crafted web page, trick the victim into visiting it and crash the browser.
Note, the vulnerability affects 32-bit platforms only.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 87.0
Firefox ESR: 60.0 - 78.9.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:60.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.2:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
11) Buffer overflow
EUVDB-ID: #VU52345
Risk: High
CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-29947
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing web content. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 87.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:80.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:80.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:81.0:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
12) Input validation error
EUVDB-ID: #VU52346
Risk: Low
CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-29946
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input. Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 87.0
Firefox ESR: 60.0 - 78.9.0
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:60.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:60.0.2:*:*:*:*:*:*:*
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
