CVE-2021-41617

HIGH 1 PoC
MEDIUM Priority: 0.18 BB Relevance: 40/100
Published: 2021-09-26 Modified: 2026-11-10 First seen: 2026-11-10 Status: active

Attack Surface

No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Local
AC: High
PR: Low
UI: None
S: Unchanged
C: High
I: High
A: High

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.

Proof of Concept (1)

Bug Bounty Relevance

40 / 100
✓ No user interaction
✓ PoC available (1)

CVSS Score

7.0 / 10.0 v3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploitation Probability

2.54%
Raw Score 0.025450
Percentile 85.3%
Date 2026-11-13

EPSS Trend

2026-11-13
0.02545
2026-11-12
0.02545
2026-11-10
0.02545
2026-11-09
0.02545

Intelligence Sources

mitre ref →
nvd ref →