What’s Vulnerable › Vulnerabilities
CVE-2021-39272
- Severity: medium (CVSS 5.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-08-30 · updated 2026-06-17
- Weakness: CWE-319
Description
Fetchmail before 6.4.22 fails to enforce STARTTLS session encryption in some circumstances, such as a certain situation with IMAP and PREAUTH.
Affected products
- Fedoraproject Fedora: 33, 34, 35
- fetchmail: before 6.4.22 — fixed in 6.4.22
How to fix
Upgrade to a fixed version: fetchmail 6.4.22. Check the vendor advisory for mitigations.
References
- http://www.openwall.com/lists/oss-security/2021/08/27/3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3XJ6XLEJCEZCAM5LGGD6XBCC522QLG4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXMKSEHAQSEDCWZMAOJEGX3P3JW6QY6H/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYCYLL73NP7ALJWSDICIVSA47ZIXWSSA/
- https://nostarttls.secvuln.info/
- https://security.gentoo.org/glsa/202209-14
- https://www.fetchmail.info/security.html
- http://www.openwall.com/lists/oss-security/2021/08/27/3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3XJ6XLEJCEZCAM5LGGD6XBCC522QLG4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXMKSEHAQSEDCWZMAOJEGX3P3JW6QY6H/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYCYLL73NP7ALJWSDICIVSA47ZIXWSSA/
- https://nostarttls.secvuln.info/
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