CVE-2018-1172

Name: CVE-2018-1172
Creator: NVD / NIST
Published: 2018-05-16T21:29:00.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 8.94%

Last modified Jun 17, 2026

CVE-2018-1172 is a vulnerability of currently unknown severity. 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. EPSS estimates a 8.94% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

8.94%

94.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	3.5.27

References

http://www.squid-cache.org/Advisories/SQUID-2018_3.txtVendor Advisory
https://zerodayinitiative.com/advisories/ZDI-18-309Third Party Advisory, VDB Entry
http://www.squid-cache.org/Advisories/SQUID-2018_3.txtVendor Advisory
https://zerodayinitiative.com/advisories/ZDI-18-309Third Party Advisory, VDB Entry

Timeline

Published: May 16, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1172?

How severe is CVE-2018-1172?

Severity scoring for CVE-2018-1172 is pending analysis. The EPSS model estimates a 8.94% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1172?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1172?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST