Is CVE-2018-1000027 in the CISA KEV catalog?

No. CVE-2018-1000027 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-1000027?

CVE-2018-1000027 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-1000027?

CVE-2018-1000027 has an EPSS score of 13.15% (96th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-1000027?

Upgrade squid on debian 11 to 4.1-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2018-1000027

HIGHEPSS 96th pctl

7.5

CVSS v3

NVD

Description

The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

squidDebian

Fixed in:4.1-1CVE-2018-1000027

squid3Ubuntu

Fixed in:3.3.8-1ubuntu6.11USN-3557-1

Fixed in:3.5.12-1ubuntu7.5USN-3557-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

13.15%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

Patch3

Third-Party Advisory5

Other references1

usn.ubuntu.com

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.