CVE-2021-40347
postorius - security update
5.4
MEDIUM
CVSS 3.1
EPSS 0.21%
Description
An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.
How to fix CVE-2021-40347
To remediate CVE-2021-40347, upgrade the affected package to a fixed version below.
- —upgrade to 1.3.4-2+deb11u1 or later
- —upgrade to 1.2.4-1+deb10u1 or later
- —upgrade to 1.3.5 or later
- —upgrade to 1.3.5 or later
Is CVE-2021-40347 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.3.4-2+deb11u1
- from 0, < 1.2.4-1+deb10u1
- from 0, < 1.3.5
- from 0, < 1.3.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |