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Fencer Intel
medium 5.0

CVE-2013-4123 json

client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a craft…

published 13y ago modified 4mo ago also EUVD-2013-4051

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
80.5%
EPSS 80.5% chance of exploitation in 30 days, percentile 99.6%
public exploits
1
Exploit-DB

Summary

client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a crafted port number in a HTTP Host header.

Patch / fix

Is CVE-2013-4123 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-4123 updated cvss 5.0

squid: Denial of service when processing specially-crafted HTTP requests (SQUID-2013:3)

  • Red Hat Enterprise Linux 5 squid Red Hat Enterprise Linux 6 squid Red Hat Enterprise Linux 7 squid, squid-sysvinit, squid-migration-script
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-26886)
  2. Published

Exploit prediction

80.45% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-26886 Squid 3.3.5 - Denial of Service (PoC) dos, 2013-07-16

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.