CVE-2021-36386

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.

• CWE-909

• http://www.openwall.com/lists/oss-security/2021/07/28/5Mailing List, Patch, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/08/09/1Mailing List
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGYO5AHSXTCKA4NQC2Z4H3XMMYNAGC77/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIXKO6QW3AUHGJVWKJXBCOVBYJUJRBFC/
• https://security.gentoo.org/glsa/202209-14Third Party Advisory
• https://www.fetchmail.info/fetchmail-SA-2021-01.txtVendor Advisory
• https://www.fetchmail.info/security.htmlVendor Advisory
• http://www.openwall.com/lists/oss-security/2021/07/28/5Mailing List, Patch, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/08/09/1Mailing List
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGYO5AHSXTCKA4NQC2Z4H3XMMYNAGC77/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIXKO6QW3AUHGJVWKJXBCOVBYJUJRBFC/
• https://security.gentoo.org/glsa/202209-14Third Party Advisory
• https://www.fetchmail.info/fetchmail-SA-2021-01.txtVendor Advisory
• https://www.fetchmail.info/security.htmlVendor Advisory

Published

Jul 30, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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