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CVE-2005-2991

11
FAUCET Score

CVE-2005-2991 describes a local privilege escalation vulnerability affecting ncompress versions 4.2.4 and earlier. An attacker can exploit this flaw via a symlink attack on temporary files created by zdiff or zcmp, allowing them to overwrite arbitrary files on the system. With a CVSS score of 2.1 (AV:L/AC:L/Au:N/C:N/I:P/A:N), this vulnerability has low severity, requiring local access and user interaction for a low impact on integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.4_r1CPE matchmatch criteria
cpe:2.3:a:ncompress:ncompress:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.1LOW

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
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
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 37th percentile among its peer group of 2,096 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.6 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Advisories (1)

redhatCVE-2005-2991Low

ncompress: insecure tmp file handling may lead to file overwrite

Nov 9, 2021

References

marc.info
marc.info
securityreason.com / securityalert/12
zataz.net / adviso/ncompress-09052005.txt
Vendor Advisory