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Vulnerability record · CVE-2021-36386 · published 30 July 2021

CVE-2021-36386: Fetchmail vulnerability

Fetchmail · Fetchmail

report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.

7.5 CVSS 3.1 High EPSS 2.6% · top 15.5% CWE-909 · CWE-909
7.5CVSS 3.1 base score, v2 5.0
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/07/28/5 Mailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/09/1 Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGYO5AHSXTCKA4NQC2Z4H3X
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIXKO6QW3AUHGJVWKJXBCOV
https://security.gentoo.org/glsa/202209-14 Third Party Advisory
https://www.fetchmail.info/fetchmail-SA-2021-01.txt Vendor Advisory
https://www.fetchmail.info/security.html Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/07/28/5 Mailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/09/1 Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGYO5AHSXTCKA4NQC2Z4H3X
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIXKO6QW3AUHGJVWKJXBCOV
https://security.gentoo.org/glsa/202209-14 Third Party Advisory
https://www.fetchmail.info/fetchmail-SA-2021-01.txt Vendor Advisory
https://www.fetchmail.info/security.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-36386), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.