CVE-2020-15917
9.8
CRITICAL · CVSS 3.1 · EPSS 2.6% (pctl 85)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.61% — more likely to be exploited than 85% of all CVEs |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2020-07-23 |
| Last modified | 2026-06-17 |
Affected (4)
| Vendor | Product |
|---|---|
| claws-mail | claws-mail |
| fedoraproject | fedora |
| opensuse | backports sle |
| opensuse | leap |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html
- 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/6YVQB7NRBHO67Q74RS7RZCMW4ENRVBB4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVEUB764EUM5/
- https://security.gentoo.org/glsa/202007-56
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html
- 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/6YVQB7NRBHO67Q74RS7RZCMW4ENRVBB4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVEUB764EUM5/
- https://security.gentoo.org/glsa/202007-56
→ the Explorer · watch your stack · NVD