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CVE-2016-2390

33
FAUCET Score

CVE-2016-2390 describes a denial-of-service vulnerability in Squid versions before 3.5.14 and 4.0.x before 4.0.6, specifically in the FwdState::connectedToPeer method when built with OpenSSL. This flaw allows remote attackers to crash the application by sending a plaintext HTTP message, due to improper handling of SSL handshake errors. The vulnerability has a CVSSv3 score of 5.9 (Medium), indicating a network-based attack with high impact on availability, but requiring high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.5.13CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
4.0.4CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:4.0.4:*:*:*:*:*:*:*
4.0.5CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:4.0.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
25.55%
Probability of exploitation in next 30 days
EPSS Percentile
97.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2555 is in the 98th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-2390Moderate

squid: incorrect server error handling resulting in denial of service

Feb 16, 2016

References

bugs.squid-cache.org / show_bug.cgi
lists.opensuse.org / opensuse-security-announce/2016-08/msg00010.html
lists.opensuse.org / opensuse-security-announce/2016-08/msg00040.html
lists.squid-cache.org / pipermail/squid-announce/2016-February/000037.html
Vendor Advisory
lists.squid-cache.org / pipermail/squid-announce/2016-February/000038.html
Vendor Advisory
securitytracker.com / id/1035045
squid-cache.org / Advisories/SQUID-2016_1.txt
Vendor Advisory