CVE-2020-10957
In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP command causes a NULL Pointer Dereference and crash in submission-login, submission, or lmtp.
02 Description
In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP command causes a NULL Pointer Dereference and crash in submission-login, submission, or lmtp.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 7.16% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 94.2% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-05-18 13:56Z6 YR AGO
- Last updated
- 2024-08-04 11:21Z2 YR AGO
- Reserved
- 2020-03-25
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.0/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
- Weaknesses
- Data version
- 5.1
- Document digest
- ed880fee059817926d0e02e7a6c53fde4bede2acbd94ae256bddf24a34581378
05 Affected products
06 References
- dovecot.orghttps://dovecot.org/security
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2020/05/18/1
- www.openwall.com[oss-security] 20200518 Multiple vulnerabilities in Dovecot IMAP serverhttp://www.openwall.com/lists/oss-security/2020/05/18/1
- usn.ubuntu.comUSN-4361-1https://usn.ubuntu.com/4361-1/
- seclists.org20200519 Multiple vulnerabilities in Dovecot IMAP serverhttp://seclists.org/fulldisclosure/2020/May/37
- packetstormsecurity.comhttp://packetstormsecurity.com/files/157771/Open-Xchange-Dovecot-2.3.10-Null-Pointer-Dereference-Denial-Of-Service.html
- www.debian.orgDSA-4690https://www.debian.org/security/2020/dsa-4690
- lists.fedoraproject.orgFEDORA-2020-1dee17d880https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVUWHUUAFPC6XGIXYFIPTNBXLHPNM4W6/
- lists.opensuse.orgopenSUSE-SU-2020:0720http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00059.html
- lists.fedoraproject.orgFEDORA-2020-b60344c987https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TTZN2VW55ZC2AQBGBJMLRJSZIKSB2NS6/
07 Fixed in
Arch Linux
- dovecot Fixed in 2.3.10.1-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Debian 12
- dovecot Fixed in 1:2.3.10.1+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- dovecot Fixed in 1:2.3.10.1+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- dovecot Fixed in 1:2.3.10.1+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- dovecot Fixed in 1:2.3.7.2-1ubuntu3.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.