CVE-2018-1172
This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318.
Does this matter?
Lower severity and a low EPSS score (8.16%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 8.16% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- squid-cache/squid
- Source
- zdi-disclosures@trendmicro.com
EPSS moved from 11.0% on 21 September 2026 to 8.2% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.