CVE-2020-25097
Due to improper input validation, it allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by the security controls.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in Squid through 4.13 and 5.x through 5.0.4. Due to improper input validation, it allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by the security controls. This occurs for certain uri_whitespace configuration settings.
- CVSS 3.1
- 8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- EPSS
- 7.34% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-444
- Affected
- squid-cache/squid · debian/debian linux · fedoraproject/fedora · netapp/cloud manager
- Source
- cve@mitre.org
EPSS 7.3% since 26 October 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://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
- http://www.squid-cache.org/Versions/v5/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
- https://github.com/squid-cache/squid/security/advisories/GHSA-jvf6-h9gj-pmj6Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJMDRVV677AJL4BZAOLCT5LMFCGBZTC2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FBXFWKIGXPERDVQXG556LLPUOCMQGERC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O3RYBDMJCPYGOSURWDR3WJTE474UFT77/
- https://security.gentoo.org/glsa/202105-14Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210727-0010/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4873Third Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
- http://www.squid-cache.org/Versions/v5/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
- https://github.com/squid-cache/squid/security/advisories/GHSA-jvf6-h9gj-pmj6Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJMDRVV677AJL4BZAOLCT5LMFCGBZTC2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FBXFWKIGXPERDVQXG556LLPUOCMQGERC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O3RYBDMJCPYGOSURWDR3WJTE474UFT77/
- https://security.gentoo.org/glsa/202105-14Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210727-0010/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4873Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.