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CVE-2011-4327

20
FAUCET Score

CVE-2011-4327 describes a vulnerability in ssh-keysign in OpenSSH before version 5.8p2, specifically affecting OpenBSD, where unintended open file descriptors are passed to ssh-rand-helper. This allows local users to potentially extract sensitive key information using the ptrace system call. The vulnerability has a low severity CVSS score of 2.1 (AV:L/AC:L/Au:N/C:P/I:N/A:N), indicating local access and low attack complexity are required for a partial confidentiality impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.8CPE matchmatch criteria
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
1.2CPE matchmatch criteria
cpe:2.3:a:openbsd:openssh:1.2:*:*:*:*:*:*:*
1.2.1CPE matchmatch criteria
cpe:2.3:a:openbsd:openssh:1.2.1:*:*:*:*:*:*:*
1.2.2CPE matchmatch criteria
cpe:2.3:a:openbsd:openssh:1.2.2:*:*:*:*:*:*:*
1.2.3CPE matchmatch criteria
cpe:2.3:a:openbsd:openssh:1.2.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.1LOW

AV:L/AC:L/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.42%
Probability of exploitation in next 30 days
EPSS Percentile
34.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 89th percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2011-4327Moderate

openssh: Unauthorized local access to host keys on platforms where ssh-rand-helper used

May 5, 2011

References

bugzilla.redhat.com / show_bug.cgi
openssh.com / txt/portable-keysign-rand-helper.adv
Vendor Advisory