Is CVE-2021-29957 in the CISA KEV catalog?

No. CVE-2021-29957 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29957?

CVE-2021-29957 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-29957?

CVE-2021-29957 has an EPSS score of 0.94% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29957?

Upgrade thunderbird on debian 11 to 1:78.10.2-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29957

MEDIUM

4.3

CVSS v3

NVD

Description

If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected. This vulnerability affects Thunderbird < 78.10.2.

How to fix

Remediation Available

thunderbirdDebian

Fixed in:1:78.10.2-1CVE-2021-29957

thunderbirdUbuntu

Fixed in:1:78.11.0+build1-0ubuntu0.18.04.2USN-4995-2

Fixed in:1:78.11.0+build1-0ubuntu0.20.04.2USN-4995-1

Mozilla Thunderbird (en-US)Windows application

Affected:78.10.2Fixed in:78.10.2Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

0.94%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.