Is CVE-2021-28652 in the CISA KEV catalog?

No. CVE-2021-28652 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28652?

CVE-2021-28652 has a CVSS v3 base score of 4.9 (MEDIUM).

What is the EPSS score for CVE-2021-28652?

CVE-2021-28652 has an EPSS score of 4.34% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28652?

Upgrade squid on debian 11 to 4.13-10 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-28652

MEDIUMEPSS 90th pctl

4.9

CVSS v3

NVD

Description

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

squidDebian

Fixed in:4.13-10CVE-2021-28652

squidUbuntu

Fixed in:3.5.27-1ubuntu1.11USN-4981-1

Fixed in:4.10-1ubuntu1.4USN-4981-1

squid3Ubuntu

Fixed in:3.5.27-1ubuntu1.11USN-4981-1

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 RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

4.34%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

github.com

Exploit1

bugs.squid-cache.org

Third-Party Advisory4

Other references2

Related Vulnerabilities

Other CWE-401 (Missing Release of Memory (Memory Leak)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13934	High	7.5	64%	-	Fix
CVE-2016-6304	High	7.5	63%	-	Fix
CVE-2019-12265	Medium	5.3	55%	-	Fix
CVE-2001-0136	Medium	5.0	45%	-	-
CVE-2016-4232	High	7.5	36%	-	-
CVE-2001-0543	Medium	5.0	19%	-	-

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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.