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CVE

CVE-1999-0041

Buffer overflow in NLS (Natural Language Service).

Buffer overflow in NLS (Natural Language Service).

HIGH · CVSS 7.5 EPSS 0.06494
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  • EPSS percentile: top 9% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
▤

Affected Products & Versions

6
gnu libcall versions
cray unicosall versions
cray unicos maxall versions
ibm aixall versions
redhat linuxall versions
slackware linuxall versions
⚠

Public Exploits & PoCs

2
localUNICOS 9/MAX 1.3/mk 1.5 / AIX 4.2 / libc 5.2.18 / RedHat 4 / IRIX 6 / Slackware 3 - NLS (1)verified
localUNICOS 9/MAX 1.3/mk 1.5 / AIX 4.2 / libc 5.2.18 / RedHat 4 / IRIX 6 / Slackware 3 - NLS (2)verified
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productcriticalLinux Reverse Shell Indicator
producthighCommunication To LocaltoNet Tunneling Service Initiated - Linux
producthighPotentially Suspicious Malware Callback Communication - Linux
producthighLinux Crypto Mining Pool Connections
producthighCommunication To Ngrok Tunneling Service - Linux
producthighLinux Crypto Mining Indicators
▣

Scoring & Timeline

7.5
HIGH · CVSS v2 (legacy) · cve@mitre.org
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Published to NVD13 Feb 1997 · 05:00 AM
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0041
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