CVE-2020-15917 json
common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.
published 2020-07-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7889
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.6%
- EPSS 2.6% chance of exploitation in 30 days, percentile 85%
- public exploits
- 0
- none known
Summary
common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.
Patch / fix
- claws-mail claws-mail 3.17.6
- claws-mail Debian 14, Debian 13, Debian 12 3.17.6-1
debian advisories DEBIAN-CVE-2020-15917
- claws-mail openSUSE Tumbleweed 4.0.0-2.5
- claws-mail Package Hub 15 SP3, Package Hub 15 SP2, openSUSE Leap 15.3 +1 more 3.18.0-bp153.2.3.1
- claws-mail Package Hub 15 SP2, Package Hub 15 SP1, openSUSE Leap 15.2 +1 more 3.17.8-bp152.3.6.1
- claws-mail Package Hub 15 SP1 3.17.3-bp151.3.3.1
- claws-mail Package Hub 15 SP2 3.17.6-bp152.3.3.1
- claws-mail openSUSE Leap 15.2 3.17.6-lp152.3.3.1
- claws-mail openSUSE Leap 15.1 3.17.3-lp151.2.3.1
opensuse advisories openSUSE-SU-2024:10686-1openSUSE-SU-2021:1045-1openSUSE-SU-2020:1822-1openSUSE-SU-2020:1269-1openSUSE-SU-2020:1192-1openSUSE-SU-2020:1139-1
- claws-mail Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 3.17.6-r0
alpine advisories ALPINE-CVE-2020-15917
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-15917 updated cvss 9.1
claws-mail: protocol violation because suffix data after STARTTLS is mishandled
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.61% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
References
-
security.gentoo.org
/glsa/202007-56
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-07/msg00090.html
vendor-advisory, mailing-list, third-party-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVEUB764EUM5/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/6YVQB7NRBHO67Q74RS7RZCMW4ENRVBB4/
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-08/msg00002.html
vendor-advisory, broken-link, mailing-list, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-08/msg00060.html
vendor-advisory, broken-link, mailing-list, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-09/msg00051.html
vendor-advisory, broken-link, mailing-list, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-11/msg00013.html
vendor-advisory, broken-link, mailing-list, third-party-advisory
- git.claws-mail.org /?p=claws.git%3Ba=commit%3Bh=fcc25329049b6f9bd8d890f1197ed61eb12e14d5
- git.claws-mail.org /?p=claws.git%3Ba=blob%3Bf=RELEASE_NOTES
Sources
- CVE List CVE-2020-15917
- NVD CVE-2020-15917
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.