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CVE-1999-0956

18
FAUCET Score

CVE-1999-0956 describes a critical vulnerability in NeXT NetInfo where the _writers property allows local users to escalate privileges to root or cause a denial of service on affected NeXTSTEP systems. With a CVSS score of 7.2 (HIGH), this vulnerability has a low attack complexity and requires local access, but grants complete confidentiality, integrity, and availability impact. Despite its high severity, there is no known exploit intelligence, such as Metasploit modules or ExploitDB entries, and it has not been added to the CISA KEV catalog. Furthermore, there is no evidence of active exploitation, community discussion, or media coverage surrounding this nearly 25-year-old vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
1.0CPE matchmatch criteria
cpe:2.3:o:next:nextstep:1.0:*:*:*:*:*:*:*
1.0aCPE matchmatch criteria
cpe:2.3:o:next:nextstep:1.0a:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:o:next:nextstep:2.0:*:*:*:*:*:*:*
2.1CPE matchmatch criteria
cpe:2.3:o:next:nextstep:2.1:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:next:nextstep:3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.2HIGH

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
32.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 44th percentile among its peer group of 3,237 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, 0.1 Bluesky, 0.0 Mastodon, and 0.5 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

Remediation records are not available for this CVE.

References

exchange.xforce.ibmcloud.com / vulnerabilities/CVE-1999-0956