CVE-2020-15917
common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.
02 Description
common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.
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
- 2.61% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 84.9% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (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:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
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
- 2020-07-23 18:06Z6 YR AGO
- Last updated
- 2024-08-04 13:30Z2 YR AGO
- Reserved
- 2020-07-23
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- No CWE assigned
- Data version
- 5.1
- Document digest
- 94baab28eabac0ed8d8dab6be8a108bad2efd24428f4f0bff398cf0fad3f92a3
05 Affected products
06 References
- git.claws-mail.orghttps://git.claws-mail.org/?p=claws.git%3Ba=commit%3Bh=fcc25329049b6f9bd8d890f1197ed61eb12e14d5
- git.claws-mail.orghttps://git.claws-mail.org/?p=claws.git%3Ba=blob%3Bf=RELEASE_NOTES
- security.gentoo.orgGLSA-202007-56https://security.gentoo.org/glsa/202007-56
- lists.opensuse.orgopenSUSE-SU-2020:1116http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html
- lists.fedoraproject.orgFEDORA-2020-2def860ce7https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVEUB764EUM5/
- lists.fedoraproject.orgFEDORA-2020-fe6c1a9c16https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YVQB7NRBHO67Q74RS7RZCMW4ENRVBB4/
- lists.opensuse.orgopenSUSE-SU-2020:1139http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html
- lists.opensuse.orgopenSUSE-SU-2020:1269http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html
- lists.opensuse.orgopenSUSE-SU-2020:1192http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html
- lists.opensuse.orgopenSUSE-SU-2020:1822http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html
07 Fixed in
Debian 12
- claws-mail Fixed in 3.17.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- claws-mail Fixed in 3.17.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- claws-mail Fixed in 3.17.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- claws-mail No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- claws-mail No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- claws-mail No fix yet
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.