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.

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.

EPSS: 0.086 (94.5th percentile) — read the EPSS interpretation.

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.

Affected products

Squid-cache Squid — versions 3.5.27
The Squid Software Foundation — versions 3.5.27-20180318

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

andir/nixos-issue-db-example

References

zdi-disclosures@trendmicro.com (VDB Entry, Third Party Advisory, x_refsource_MISC)
zdi-disclosures@trendmicro.com (x_refsource_CONFIRM, 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.