CVE-2016-4554: n/a vulnerability

CVE-2016-4554: mime_header.cc in Squid before 3.5.18 allows remote attackers to bypass intended same-origin restrictions a...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 00:32 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2016-4554 affects Squid proxy/cache servers before 3.5.18. A remote client could craft an HTTP Host header that bypasses intended same-origin protections and may poison cached content. Business impact is mainly integrity and trust in web traffic handled through vulnerable Squid instances. Organizations running Squid proxy/cache versions before 3.5.18, including vulnerable distribution packages, are the likely exposure. Internet-facing or broadly accessible proxies have higher practical risk. The provided data does not identify specific non-Squid products beyond distribution-maintained Squid packages. Prioritize remediation for Squid proxies exposed to users or the internet. This is not flagged as actively exploited in the provided sources, but cache poisoning can undermine content integrity and user trust. Treat legacy unpatched Squid deployments as a cleanup priority. Mitigation focus: Upgrade Squid to 3.5.18 or later where applicable.; Apply the relevant distribution security update for Squid.; Review Squid SQUID-2016_8 advisory and vendor package guidance..

Prepared: Jun 13, 2026, 16:10 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 10, 2016, 19:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
GLSA-201607-01CVE reference · vendor-advisory, x_refsource_GENTOO
RHSA-2016:1140CVE reference · vendor-advisory, x_refsource_REDHAT
RHSA-2016:1138CVE reference · vendor-advisory, x_refsource_REDHAT
RHSA-2016:1139CVE reference · vendor-advisory, x_refsource_REDHAT

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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