CVE-2021-31806
6.5
MEDIUM
CVSS 3.1
EPSS 85.2%
Description
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.
How to fix CVE-2021-31806
To remediate CVE-2021-31806, upgrade the affected package to a fixed version below.
- Alpine/squid—upgrade to 4.15-r0 or later
- Debian/squid—upgrade to 4.13-10 or later
Is CVE-2021-31806 being exploited?
Likely — EPSS is 85.2%, placing CVE-2021-31806 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (2)
- from 0, < 4.15-r0
- from 0, < 4.13-10
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |