NULL Pointer Dereference Affecting squid package, versions <4.1-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Jul 2026
- disclosed16 May 2018
Introduced: 16 May 2018
CVE-2018-1172 (opens in a new tab)How to fix?
Upgrade Echo:latest squid to version 4.1-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream squid package and not the squid package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.