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Fencer Vulns
critical 9.3

CVE-2009-0641 json

sys_term.c in telnetd in FreeBSD 7.0-RELEASE and other 7.x versions deletes dangerous environment variables with a method that was valid on…

published 2009-02-18 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0644

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.3%
EPSS 9.3% chance of exploitation in 30 days, percentile 95%
public exploits
1
Exploit-DB

Summary

sys_term.c in telnetd in FreeBSD 7.0-RELEASE and other 7.x versions deletes dangerous environment variables with a method that was valid only in older FreeBSD distributions, which might allow remote attackers to execute arbitrary code by passing a crafted environment variable from a telnet client, as demonstrated by an LD_PRELOAD value that references a malicious library.

Patch / fix

Timeline

  1. First public exploit (EDB-8055)
  2. Published

Exploit prediction

9.32% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-8055 FreeBSD 7.0-RELEASE - Telnet Daemon Privilege Escalation local, 2009-02-16
  • securityfocus.com http://www.securityfocus.com/bid/33777 referenced PoC, tagged "exploit" by a source, unverified
  • lists.grok.org.uk http://lists.grok.org.uk/pipermail/full-disclosure/2009-February/067954.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-16 Configuration
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.