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Vulnerability record · CVE-2020-15917 · published 23 July 2020

CVE-2020-15917: Claws-mail vulnerability

Claws Mail · Claws Mail

common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.

9.8 CVSS 3.1 Critical EPSS 2.6% · top 14.9%
9.8CVSS 3.1 base score, v2 7.5
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html Broken LinkMailing ListThird Party Advisory
https://git.claws-mail.org/?p=claws.git%3Ba=blob%3Bf=RELEASE_NOTES
https://git.claws-mail.org/?p=claws.git%3Ba=commit%3Bh=fcc25329049b6f9bd8d890f1197ed61eb12e14d5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YVQB7NRBHO67Q74RS7RZCM
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVE
https://security.gentoo.org/glsa/202007-56 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html Broken LinkMailing ListThird Party Advisory
https://git.claws-mail.org/?p=claws.git%3Ba=blob%3Bf=RELEASE_NOTES
https://git.claws-mail.org/?p=claws.git%3Ba=commit%3Bh=fcc25329049b6f9bd8d890f1197ed61eb12e14d5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YVQB7NRBHO67Q74RS7RZCM
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVE
https://security.gentoo.org/glsa/202007-56 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-15917), CISA KEV, FIRST EPSS (scores of 2026-10-15). This page is refreshed as NVD updates the record.