CVE-2011-1843: Integer overflow in conf.c in Tinyproxy before 1.8.3 might allow remote attackers to bypass intended access re

Q: How do I fix CVE-2011-1843?

tinyproxy: upgrade to newer than 1.8.2. Exact commands for each OS are on this page.

Q: Is CVE-2011-1843 being exploited?

CVE-2011-1843 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-1843 affect?

CVE-2011-1843 affects tinyproxy. Severity is medium (CVSS 6.8). Integer overflow in conf.c in Tinyproxy before 1.8.3 might allow remote attackers to bypass intended access restrictions in opportunistic circumstances via a TCP connection, related to improper handling of invalid port numbers.

Q: How urgent is CVE-2011-1843?

Priority 47/100. Public exploit reference

This month

MEDIUM 6.8UPGRADE

CVE-2011-1843 is a medium-severity flaw (CVSS 6.8) affecting tinyproxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in conf.c in Tinyproxy before 1.8.3 might allow remote attackers to bypass intended access restrictions in opportunistic circumstances via a TCP connection, related to improper handling of invalid port numbers.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-189
Published	2011-05-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: banu

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2011-05-03 00:55 UTCPublished CVE record published
2026-06-16 23:30 UTCUpdated Record last modified

banu tinyproxy UPGRADE

Affected: <= 1.8.2 · 1.5.0 · 1.5.0 pre1 · 1.5.0 pre2 · 1.5.0 pre3 · 1.5.0 pre4 · 1.5.0 pre5 · 1.5.0 pre6

Fixed in: newer than 1.8.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tinyproxy || rpm -q tinyproxy || tinyproxy --version

2. UPGRADE to newer than 1.8.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tinyproxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tinyproxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-1843?

tinyproxy: upgrade to newer than 1.8.2. Exact commands for each OS are on this page.

Is CVE-2011-1843 being exploited?

CVE-2011-1843 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-1843 affect?

CVE-2011-1843 affects tinyproxy. Severity is medium (CVSS 6.8). Integer overflow in conf.c in Tinyproxy before 1.8.3 might allow remote attackers to bypass intended access restrictions in opportunistic circumstances via a TCP connection, related to improper handling of invalid port numbers.

How urgent is CVE-2011-1843?

Priority 47/100. Public exploit reference

Related CVEs

CVE-2026-31842 HIGH 7.5 UPGRADE Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive compa
CVE-2025-63938 MEDIUM 6.5 UPGRADE Tinyproxy through 1.11.2 contains an integer overflow vulnerability in the strip_return_port() function within
CVE-2023-49606 CRITICAL 9.8 DOWNGRADE A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy
CVE-2022-40468 HIGH 7.5 UPGRADE Potential leak of left-over heap data if custom error page templates containing special non-standard variables
CVE-2017-11747 MEDIUM 5.5 UPGRADE main.c in Tinyproxy 1.8.4 and earlier creates a /run/tinyproxy/tinyproxy.pid file after dropping privileges to

References

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