Is CVE-2021-41617 in the CISA KEV catalog?

No. CVE-2021-41617 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-41617?

CVE-2021-41617 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2021-41617?

CVE-2021-41617 has an EPSS score of 2.37% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-41617?

Upgrade openssh on debian 11 to 1:8.4p1-5+deb11u3 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-41617

HIGHEPSS 82th pctl

7.0

CVSS v3

NVD

Description

sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default configurations are used, allows privilege escalation because supplemental groups are not initialized as expected. Helper programs for AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group memberships of the sshd process, if the configuration specifies running the command as a different user.

How to fix

Remediation Available

opensshDebian

Fixed in:1:8.4p1-5+deb11u3CVE-2021-41617

Fixed in:1:8.7p1-1CVE-2021-41617

opensshUbuntu

Fixed in:1:7.2p2-4ubuntu2.10+esm2USN-5666-1

Fixed in:1:8.2p1-4ubuntu0.11USN-6565-1

Fixed in:1:8.9p1-3ubuntu0.6USN-6565-1

Fixed in:1:9.0p1-1ubuntu8.7USN-6565-1

Fixed in:1:9.3p1-1ubuntu3.2USN-6565-1

openssh-clientUbuntu

Fixed in:1:8.2p1-4ubuntu0.11USN-6565-1

Fixed in:1:8.9p1-3ubuntu0.6USN-6565-1

Fixed in:1:9.0p1-1ubuntu8.7USN-6565-1

Fixed in:1:9.3p1-1ubuntu3.2USN-6565-1

openssh-serverUbuntu

Fixed in:1:7.2p2-4ubuntu2.10+esm2USN-5666-1

Fixed in:1:8.2p1-4ubuntu0.11USN-6565-1

Fixed in:1:8.9p1-3ubuntu0.6USN-6565-1

Fixed in:1:9.0p1-1ubuntu8.7USN-6565-1

Fixed in:1:9.3p1-1ubuntu3.2USN-6565-1

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.37%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch2

Vendor Advisory2

Third-Party Advisory4

Other references7

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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 2026-05-12.