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Fencer Intel
critical 9.3

CVE-2011-2940 json

stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unsp…

published 2011-08-25 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2908

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.7%
EPSS 5.7% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

Patch / fix

  • stunnel4 Debian 13, Debian 12 3:4.42-1

debian advisories DEBIAN-CVE-2011-2940

  • stunnel openSUSE Tumbleweed 5.38-1.1

opensuse advisories openSUSE-SU-2024:10289-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-2940 updated cvss 6.8

stunnel: heap corruption flaw in 4.4x leads to remote DoS and possible code execution

  • Red Hat Enterprise Linux 4 stunnel Red Hat Enterprise Linux 5 stunnel Red Hat Enterprise Linux 6 stunnel
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.71% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

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-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel 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.