CVE-2018-1172

Severity: medium (CVSS 5.9 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 8.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-05-16 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

Squid: 3.5.27

References

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

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