Is CVE-2021-29969 in the CISA KEV catalog?

No. CVE-2021-29969 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29969?

CVE-2021-29969 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2021-29969?

CVE-2021-29969 has an EPSS score of 1.20% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29969?

Upgrade thunderbird on debian 11 to 1:78.12.0-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29969

MEDIUM

5.9

CVSS v3

NVD

Description

If Thunderbird was configured to use STARTTLS for an IMAP connection, and an attacker injected IMAP server responses prior to the completion of the STARTTLS handshake, then Thunderbird didn't ignore the injected data. This could have resulted in Thunderbird showing incorrect information, for example the attacker could have tricked Thunderbird to show folders that didn't exist on the IMAP server. This vulnerability affects Thunderbird < 78.12.

CWE-552

How to fix

Remediation Available

thunderbirdDebian

Fixed in:1:78.12.0-1CVE-2021-29969

thunderbirdUbuntu

Fixed in:1:78.13.0+build1-0ubuntu0.18.04.1USN-5058-1

Fixed in:1:78.13.0+build1-0ubuntu0.20.04.2USN-5058-1

Mozilla Thunderbird (en-US)Windows application

Affected:78.12Fixed in:78.12Mozilla

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.20%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory1

security.gentoo.org

Related Vulnerabilities

Other CWE-552 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-17519	High	7.5	98%	KEV	Fix
CVE-2025-11371	High	7.5	92%	KEV	Fix
CVE-2023-50164	Critical	9.8	81%	-	Fix
CVE-2016-3715	Medium	5.5	75%	KEV	Fix
CVE-2020-15175	High	7.4	71%	-	Fix
CVE-2021-39316	High	7.5	67%	-	-

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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.