CVE-2020-12137
This behavior may contribute to XSS attacks against list-archive visitors, because an HTTP reply from an archive web server may lack a MIME type, and a web browser may perform MIME sniffing, conclude that the MIME type should have been text/html, and…
Does this matter?
Lower severity and a low EPSS score (2.29%). Track it; it rarely justifies an emergency change on its own.
Description
GNU Mailman 2.x before 2.1.30 uses the .obj extension for scrubbed application/octet-stream MIME parts. This behavior may contribute to XSS attacks against list-archive visitors, because an HTTP reply from an archive web server may lack a MIME type, and a web browser may perform MIME sniffing, conclude that the MIME type should have been text/html, and execute JavaScript code.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 2.29% probability · 83th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- gnu/mailman · debian/debian linux · fedoraproject/fedora · canonical/ubuntu linux · opensuse/backports sle · opensuse/leap
- Source
- cve@mitre.org
EPSS 2.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWSThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.htmlMailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/04/24/3Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00002.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YCMGTTOXXCVM4O6CYZLTZDX6YLYORNF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4COSBBEMJYLV7WSW5QTUJUOFJFK47KK/
- https://usn.ubuntu.com/4348-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4664Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/02/24/2Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/02/24/3Mailing List, Third Party Advisory
- http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWSThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.htmlMailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/04/24/3Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00002.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YCMGTTOXXCVM4O6CYZLTZDX6YLYORNF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4COSBBEMJYLV7WSW5QTUJUOFJFK47KK/
- https://usn.ubuntu.com/4348-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4664Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/02/24/2Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/02/24/3Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.