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Fencer Intel
medium 5.8

CVE-2015-3644 json

Stunnel 5.00 through 5.13, when using the redirect option, does not redirect client connections to the expected server after the initial co…

published 11y ago modified 4mo ago also EUVD-2015-3682

cvss
5.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

Stunnel 5.00 through 5.13, when using the redirect option, does not redirect client connections to the expected server after the initial connection, which allows remote attackers to bypass authentication.

Patch / fix

  • stunnel4 Debian 13, Debian 12 3:5.18-1

debian advisories DEBIAN-CVE-2015-3644

  • stunnel SLES for SAP 12, SLES 12 5.00-3.1

suse advisories SUSE-SU-2015:1062-1

  • stunnel openSUSE Tumbleweed 5.65-1.1

opensuse advisories openSUSE-SU-2024:12196-1

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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-2015-3644 updated cvss 6.4

stunnel: authentication bypass with the "redirect" option

  • Red Hat Enterprise Linux 5 stunnel Red Hat Enterprise Linux 6 stunnel Red Hat Enterprise Linux 7 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

2.12% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness

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.