CVE & CISA-KEV Catalog

CVE-2023-49606

CRITICALEPSS 99th pctl
9.8
CVSS v3
NVD

Description

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.

CWE-416Use After Free

How to fix

Remediation Available
tinyproxyDebian
Fixed in:1.10.0-5+deb11u1CVE-2023-49606
Fixed in:1.11.1-2.1+deb12u1CVE-2023-49606
Fixed in:1.11.1-4CVE-2023-49606
Fixed in:1.11.1-4CVE-2023-49606
tinyproxyUbuntu
Fixed in:1.8.3-3ubuntu14.04.1~esm3USN-7190-1
Fixed in:1.8.3-3ubuntu16.04.1~esm3USN-7190-1
Fixed in:1.8.4-5ubuntu0.1~esm3USN-7190-1
Fixed in:1.10.0-4ubuntu0.2USN-7190-1
Fixed in:1.11.0-1ubuntu0.1~esm2USN-7190-1
Fixed in:1.11.1-3ubuntu0.1USN-7190-1
tinyproxy-binUbuntu
Fixed in:1.8.4-5ubuntu0.1~esm3USN-7190-1
Fixed in:1.10.0-4ubuntu0.2USN-7190-1
Fixed in:1.11.0-1ubuntu0.1~esm2USN-7190-1
Fixed in:1.11.1-3ubuntu0.1USN-7190-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

63.08%probability of exploitation in 30 days
99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2019-0708Critical9.8100%KEV + Ransom-
CVE-2021-31166Critical9.8100%KEVFix
CVE-2015-5119Critical9.899%KEV-
CVE-2010-3962High8.196%KEV-
CVE-2015-0313Critical9.896%KEVFix
CVE-2021-34833High7.896%--

Common questions

How do I fix CVE-2023-49606?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2023-49606 being actively exploited?

Not that we know of. CVE-2023-49606 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 63.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2023-49606?

CVE-2023-49606 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2023-49606 affect?

Published advisories record a fix for tinyproxy (Debian), tinyproxy (Ubuntu), tinyproxy-bin (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.