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Fencer Vulns
critical 9.8

CVE-2023-49606 in the critical feed json

A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0.

published 2024-05-01 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-53554

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
63.1%
EPSS 63.1% chance of exploitation in 30 days, percentile 99.2%
public exploits
0
none known

Summary

A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0. A specially crafted HTTP header can trigger reuse of previously freed memory, which leads to memory corruption and could lead to remote code execution. An attacker needs to make an unauthenticated HTTP request to trigger this vulnerability.

Patch / fix

  • tinyproxy tinyproxy 1.11.2
  • tinyproxy_project tinyproxy 1.11.2
  • tinyproxy Debian 12 1.11.1-2.1+deb12u1
  • tinyproxy Debian 14, Debian 13 1.11.1-4

debian advisories DEBIAN-CVE-2023-49606

  • tinyproxy Ubuntu 20.04 LTS 1.10.0-4ubuntu0.2
  • tinyproxy Ubuntu 24.04 LTS 1.11.1-3ubuntu0.1
  • tinyproxy Ubuntu 26.04 LTS, Ubuntu 25.10 1.11.2-1
  • tinyproxy Ubuntu Pro 14.04 LTS 1.8.3-3ubuntu14.04.1~esm3
  • tinyproxy Ubuntu Pro 16.04 LTS 1.8.3-3ubuntu16.04.1~esm3
  • tinyproxy Ubuntu Pro 18.04 LTS 1.8.4-5ubuntu0.1~esm3
  • tinyproxy Ubuntu Pro 22.04 LTS 1.11.0-1ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2023-49606

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tinyproxy openSUSE Tumbleweed 1.11.2-1.1
  • tinyproxy Package Hub 15 SP5, openSUSE Leap 15.5 1.11.2-bp155.3.3.1

opensuse advisories openSUSE-SU-2024:13943-1openSUSE-SU-2024:0119-1

  • tinyproxy Alpine 3.24, Alpine 3.23, Alpine 3.22 +6 more 1.11.2-r0

alpine advisories ALPINE-CVE-2023-49606

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2023-49606 updated cvss 9.8

tinyproxy: HTTP connection headers use-after-free vulnerability

  • Red Hat All currently supported Red Hat products
    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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

63.08% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2024/05/07/1 referenced PoC, tagged "exploit" by a source, unverified
  • talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2023-1889 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Tinyproxy Tinyproxy

Classification

Weakness

References

Sources

Fencer Vulns 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.