What’s Vulnerable › Vulnerabilities

CVE-2020-10958

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-05-18 · updated 2026-06-17
• Weakness: CWE-416

Description

In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines after a command.

Affected products

• dovecot: before 2.3.10.1 — fixed in 2.3.10.1

How to fix

Upgrade to a fixed version: dovecot 2.3.10.1. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00059.html
• http://packetstormsecurity.com/files/157771/Open-Xchange-Dovecot-2.3.10-Null-Pointer-Dereference-Denial-Of-Service.html
• http://seclists.org/fulldisclosure/2020/May/37
• http://www.openwall.com/lists/oss-security/2020/05/18/1
• https://dovecot.org/security
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TTZN2VW55ZC2AQBGBJMLRJSZIKSB2NS6/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVUWHUUAFPC6XGIXYFIPTNBXLHPNM4W6/
• https://usn.ubuntu.com/4361-1/
• https://www.debian.org/security/2020/dsa-4690
• https://www.openwall.com/lists/oss-security/2020/05/18/1
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00059.html
• http://packetstormsecurity.com/files/157771/Open-Xchange-Dovecot-2.3.10-Null-Pointer-Dereference-Denial-Of-Service.html

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