CVE-2021-3181

rfc822.c in Mutt through 2.0.4 allows remote attackers to cause a denial of service (mailbox unavailability) by sending email messages with sequences of semicolon characters in RFC822 address fields (aka terminators of empty groups). A small email message from the attacker can cause large memory consumption, and the victim may then be unable to see email messages from other persons.

• CWE-401

• http://www.openwall.com/lists/oss-security/2021/01/19/10Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/01/27/3Mailing List, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/commit/4a2becbdb4422aaffe3ce314991b9d670b7adf17Patch, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/commit/939b02b33ae29bc0d642570c1dcfd4b339037d19Patch, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/commit/d4305208955c5cdd9fe96dfa61e7c1e14e176a14Patch, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/issues/323Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/01/msg00017.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DXGWXFO77HBCD3VYEIYHHYU33LYWWWNQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2OMLQKAOHPYQA4GI7ZUO6UKCPUHLYO7/
• https://security.gentoo.org/glsa/202101-25Third Party Advisory
• https://www.debian.org/security/2021/dsa-4838Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/01/19/10Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/01/27/3Mailing List, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/commit/4a2becbdb4422aaffe3ce314991b9d670b7adf17Patch, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/commit/939b02b33ae29bc0d642570c1dcfd4b339037d19Patch, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/commit/d4305208955c5cdd9fe96dfa61e7c1e14e176a14Patch, Third Party Advisory
• https://gitlab.com/muttmua/mutt/-/issues/323Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/01/msg00017.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DXGWXFO77HBCD3VYEIYHHYU33LYWWWNQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2OMLQKAOHPYQA4GI7ZUO6UKCPUHLYO7/
• https://security.gentoo.org/glsa/202101-25Third Party Advisory
• https://www.debian.org/security/2021/dsa-4838Third Party Advisory

Published

Jan 19, 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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