Is CVE-2021-28041 in the CISA KEV catalog?

No. CVE-2021-28041 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28041?

CVE-2021-28041 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-28041?

CVE-2021-28041 has an EPSS score of 3.42% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28041?

Upgrade openssh on debian 11 to 1:8.4p1-5 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-28041

HIGHEPSS 88th pctl

7.1

CVSS v3

NVD

Description

ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenarios, such as unconstrained agent-socket access on a legacy operating system, or the forwarding of an agent to an attacker-controlled host.

CWE-415

How to fix

Remediation Available

opensshDebian

Fixed in:1:8.4p1-5CVE-2021-28041

opensshUbuntu

Fixed in:1:8.2p1-4ubuntu0.2USN-4762-1

openssh-clientUbuntu

Fixed in:1:8.2p1-4ubuntu0.2USN-4762-1

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 ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.42%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch2

Vendor Advisory2

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-25136	Medium	6.5	90%	-	Fix
CVE-2018-0101	Critical	10.0	87%	-	Fix
CVE-2003-0545	Critical	9.8	85%	-	Fix
CVE-2019-3829	Medium	5.3	59%	-	Fix
CVE-2026-33824	Critical	9.8	56%	-	Fix
CVE-2021-3407	Medium	5.5	50%	-	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.