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Fencer Vulns
medium 6.9

CVE-2009-1786 json

The malloc subsystem in libc in IBM AIX 5.3 and 6.1 allows local users to create or overwrite arbitrary files via a symlink attack on the l…

published 2009-05-26 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1781

cvss
6.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
1
Exploit-DB

Summary

The malloc subsystem in libc in IBM AIX 5.3 and 6.1 allows local users to create or overwrite arbitrary files via a symlink attack on the log file associated with the MALLOCDEBUG environment variable.

Patch / fix

Timeline

  1. First public exploit (EDB-33001)
  2. Published

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-33001 Kingsoft Webshield 1.1.0.62 - Cross-Site Scripting / Remote Command Execution webapps, 2009-05-20
  • exploit-db.com https://www.exploit-db.com/exploits/9306 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

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.