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CVE-2021-31806 Squid

Affected softwareSquid
Severity6.5 Medium CVSS 3.1 2 scores
WeaknessCWE-116
Published27 May 2021
Updated17 Jun 2026

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.

Exploitation status

Forecast only (95% 30-day chance)

No exploit has been reported in the sources we check. EPSS puts this CVE in the top 0.13% of all scored CVEs. That is a model's forecast, not a report of exploitation.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 95% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99.9% of all scored CVEs.

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review automated Upstream data
  • Record active
Decided by The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached
Finding This CVE names only products the Waratek agent cannot be installed into (netapp/cloud_manager). They ship as sealed appliance images or as native code with no application JVM, so there is no start-up line to add -javaagent to. The vulnerability may well be a Java one; it is permanently out of ARMR's reach rather than outside its subject.

CVSS

6.5 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 2.0 4.0 none AV:N/AC:L/Au:S/C:N/I:N/A:P NVD Primary

Affected software and releases

Products and versions

4 products, 7 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 9.0 · 10.0
nvd fedoraproject fedora generic 33 · 34
nvd netapp cloud manager generic any version
nvd squid-cache squid generic < 4.15 · ≥ 5.0 and < 5.0.6

References

URLTags
http://seclists.org/fulldisclosure/2023/Oct/14 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/10/11/3 Mailing List, Third Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patch Patch, Vendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
https://security.netapp.com/advisory/ntap-20210716-0007/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4924 Third Party Advisory

Timeline

Published2021-05-27By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.