Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 2 |
CVE-ID | CVE-2021-44538 CVE-2021-4126 |
CWE-ID | CWE-119 CWE-357 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
Mozilla Thunderbird Client/Desktop applications / Messaging software |
Vendor | Mozilla |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
EUVDB-ID: #VU59080
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-44538
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to a boundary error within the olm_session_describe() function in libolm. A remote attacker send specially crafted messages to the application that is using the affected library, trigger buffer overflow and perform a denial of service (DoS) attack
Install update from vendor's website.
Vulnerable software versionsMozilla Thunderbird: 91.0 - 91.4.0
External linkshttp://www.mozilla.org/en-US/security/advisories/mfsa2021-55/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
EUVDB-ID: #VU59081
Risk: Low
CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4126
CWE-ID:
CWE-357 - Insufficient UI Warning of Dangerous Operations
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform spoofing attacks.
The vulnerability exists in the way Thunderbird handles signed email messages. When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer, for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed message for the signature validity. This gave the false impression that the additional contents were also covered by the digital signature.
MitigationInstall update from vendor's website.
Vulnerable software versionsMozilla Thunderbird: 91.0 - 91.4.0
External linkshttp://www.mozilla.org/en-US/security/advisories/mfsa2021-55/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.