NULL pointer dereference in Squid-Cache Squid
CVE-2018-1172
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.083 (94.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.086 · newest: 0.083 · change: -0.003
Affected products
- Squid-Cache Squid — versions 3.5.27
- The Squid Software Foundation — versions 3.5.27-20180318
Weakness classification (CWE)
Public proof-of-concept exploits
References
- zerodayinitiative.com/advisories/ZDI-18-309 (VDB Entry, Third Party Advisory)
- www.squid-cache.org/Advisories/SQUID-2018_3.txt (Vendor Advisory)
Frequently asked questions
- What is CVE-2018-1172?
- CVE-2018-1172 is a medium-severity vulnerability in Squid-Cache Squid, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2018-05-16.
- How severe is CVE-2018-1172?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2018-1172 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.