CVE-2018-1172

5.9 mediumEPSS 8.2%

Medium (5.9) in squid-cache squid. EPSS 8.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.0

5.9 medium

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 8.2% chance of exploitation in the next 30 days; higher than 94% of CVEs (scores of 2026-10-31)
CWE: CWE-476
Published: 2018-05-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

squid-cache:squid

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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