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No exploitation reportedFix available

CVE-2016-2390

No exploitation reported by the sources we read.

  • Published2016-04-19
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The FwdState::connectedToPeer method in FwdState.cc in Squid before 3.5.14 and 4.0.x before 4.0.6 does not properly handle SSL handshake errors when built with the --with-openssl option, which allows remote attackers to cause a denial of service (application crash) via a plaintext HTTP message.

Timeline

dates in UTC
  1. 2016-04-1921:59CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD
Squid-cache squid
BranchAffectedFixed in
3.5≤ 3.5.13no fix published
4.0= 4.0.4no fix published
4.0= 4.0.5no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • squidDebian:14all versions · fixed in 4.1-1
  • squidDebian:13all versions · fixed in 4.1-1
  • squidDebian:12all versions · fixed in 4.1-1
  • squid3SUSE:Linux Enterprise Server for SAP Applications 11 SP4all versions · fixed in 3.1.23-8.16.30.1
  • squid3SUSE:Linux Enterprise Server 11 SP4all versions · fixed in 3.1.23-8.16.30.1

Vendor advisories

  • CVE-2016-2390 Red Hat Product Security

    squid: incorrect server error handling resulting in denial of service

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2016-04-19
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-qg6v-rjmq-c5vh

Frequently asked questions

What is CVE-2016-2390?

The FwdState::connectedToPeer method in FwdState.cc in Squid before 3.5.14 and 4.0.x before 4.0.6 does not properly handle SSL handshake errors when built with the --with-openssl option, which allows remote attackers to cause a denial of service (application crash) via a plaintext HTTP message.

Is CVE-2016-2390 actively exploited?

Active exploitation of CVE-2016-2390 has not been confirmed. Its EPSS score was 25.6% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-2390?

CVE-2016-2390 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

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