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Fencer Intel
medium 6.6

CVE-2013-1762 json

stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conver…

published 13y ago modified 4mo ago also EUVD-2013-1788

cvss
6.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conversion, which allows remote proxy servers to execute arbitrary code via a crafted request that triggers a buffer overflow.

Patch / fix

  • stunnel4 Debian 13, Debian 12 3:4.53-1.1

debian advisories DEBIAN-CVE-2013-1762

  • stunnel RHEL 6 4.29-3.el6_4

red hat advisories RHSA-2013:0714

  • stunnel openSUSE Tumbleweed 5.38-1.1

opensuse advisories openSUSE-SU-2024:10289-1

Is CVE-2013-1762 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2013-1762 updated cvss 5.1

Stunnel: buffer overflow vulnerability due to incorrect integer conversion in the NTLM authentication of the CONNECT protocol negotiation

  • Red Hat Enterprise Linux Desktop (v. 6) stunnel 4.29-3.el6_4 Red Hat Enterprise Linux HPC Node Optional (v. 6) stunnel 4.29-3.el6_4 Red Hat Enterprise Linux Server (v. 6) stunnel 4.29-3.el6_4 Red Hat Enterprise Linux Workstation (v. 6) stunnel 4.29-3.el6_4
    fixed: vendor fix RHSA-2013:0714
  • Red Hat Enterprise Linux 5 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

2.93% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.6 AV:N/AC:H/Au:N/C:P/I:P/A:C

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

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.