CVE-2021-31807
An integer overflow problem allows a remote server to achieve Denial of Service when delivering responses to HTTP Range requests.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 15.6%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 15.56% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- squid-cache/squid · fedoraproject/fedora · netapp/cloud manager
- Source
- cve@mitre.org
EPSS 15.6% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://seclists.org/fulldisclosure/2023/Oct/14Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/11/3Mailing List, Third Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patchPatch, Vendor Advisory
- https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xfThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00014.htmlMailing 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
- http://seclists.org/fulldisclosure/2023/Oct/14Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/11/3Mailing List, Third Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patchPatch, Vendor Advisory
- https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xfThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00014.htmlMailing 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.