CVE-2016-4554
HIGH · CVSS 8.6EPSS 38.9%EU EUVD
mime_header.cc in Squid before 3.5.18 allows remote attackers to bypass intended same-origin restrictions and possibly conduct cache-poisoning attacks via a crafted HTTP Host header, aka a "header smuggling" issue.
Key facts
- CVSS score
- 8.6 (v3.0)
- Severity
- HIGH
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N- Weakness (CWE)
- CWE-345
- EPSS score
- 38.9% (99th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2016-5541)
- Published
- May 10, 2016
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2016-5541 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- oracle / linux
- oracle / linux
- squid-cache / squid
Certified products that may be affected
25 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Oracle Linux 7 NSS Cryptographic Module - Oracle Corporation - FIPS 140 4586 - historical
- Oracle Linux 7 Libreswan Cryptographic Module - Oracle Corporation - FIPS 140 4266 - historical
- Oracle Linux 7 OpenSSH Client Cryptographic Module - Oracle Corporation - FIPS 140 4206 - historical
- Oracle Linux 7 OpenSSH Server Cryptographic Module - Oracle Corporation - FIPS 140 4176 - historical
- Oracle Linux 7 Unbreakable Enterprise Kernel (UEK 6) Cryptographic Module - Oracle Corporation - FIPS 140 4169 - historical
See all 25 in the Security Certifications Explorer.
References
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html
- http://www.debian.org/security/2016/dsa-3625
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html(Third Party Advisory)
- http://www.securitytracker.com/id/1035769(Third Party Advisory)
- http://www.squid-cache.org/Advisories/SQUID-2016_8.txt(Vendor Advisory)
- http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID-2016_8.patch(Patch)
- http://www.squid-cache.org/Versions/v3/3.2/changesets/SQUID-2016_8.patch(Patch)
- http://www.squid-cache.org/Versions/v3/3.3/changesets/SQUID-2016_8.patch(Patch)
- http://www.squid-cache.org/Versions/v3/3.4/changesets/SQUID-2016_8.patch(Patch)
- http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_8.patch(Patch)
- http://www.ubuntu.com/usn/USN-2995-1(Third Party Advisory)
- https://access.redhat.com/errata/RHSA-2016:1138
- https://access.redhat.com/errata/RHSA-2016:1139
- https://access.redhat.com/errata/RHSA-2016:1140
- https://security.gentoo.org/glsa/201607-01
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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