Multiple vulnerabilities in Adobe Reader and Acrobat
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2021-28554 CVE-2021-28551 CVE-2021-28552 CVE-2021-28631 CVE-2021-28632 |
| CWE-ID | CWE-125 CWE-416 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Adobe Reader Client/Desktop applications / Office applications Adobe Acrobat Client/Desktop applications / Office applications |
| Vendor | Adobe |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Out-of-bounds read
EUVDB-ID: #VU53921
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-28554
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a boundary condition when processing relative paths. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger out-of-bounds read error and compromise the affected system.
Install updates from vendor's website.
Vulnerable software versionsAdobe Reader: 21.001.20135 - 2020.013.20074
Adobe Acrobat: 17.008.30051 - 21.001.20155
External linkshttp://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-659/
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 or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Out-of-bounds read
EUVDB-ID: #VU53922
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-28551
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a boundary condition. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger out-of-bounds read error and compromise the affected system.
Install updates from vendor's website.
Vulnerable software versionsAdobe Reader: 21.001.20135 - 2020.013.20074
Adobe Acrobat: 17.008.30051 - 21.001.20155
External linkshttp://helpx.adobe.com/security/products/acrobat/apsb21-37.html
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 or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Use-after-free
EUVDB-ID: #VU53923
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-28552
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a boundary condition when processing XFA templates. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger a use-after-free error and compromise the affected system.
Install updates from vendor's website.
Vulnerable software versionsAdobe Reader: 21.001.20135 - 2020.013.20074
Adobe Acrobat: 17.008.30051 - 21.001.20155
External linkshttp://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-661/
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 or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Use-after-free
EUVDB-ID: #VU53924
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-28631
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a boundary condition when processing AcroForm fields. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger a use-after-free error and compromise the affected system.
Install updates from vendor's website.
Vulnerable software versionsAdobe Reader: 21.001.20135 - 2020.013.20074
Adobe Acrobat: 17.008.30051 - 21.001.20155
External linkshttp://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-662/
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 or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
5) Use-after-free
EUVDB-ID: #VU53925
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-28632
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a boundary condition when processing AcroForm fields. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger a use-after-free error and compromise the affected system.
Install updates from vendor's website.
Vulnerable software versionsAdobe Reader: 21.001.20135 - 2020.013.20074
Adobe Acrobat: 17.008.30051 - 21.001.20155
External linkshttp://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-663/
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 or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
