Description
Buffer overflow in the read_server_hello function in lib/gnutls_handshake.c in GnuTLS before 3.1.25, 3.2.x before 3.2.15, and 3.3.x before 3.3.4 allows remote servers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a long session id in a ServerHello message.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnutls28 | 3.2.15-1 | — |
| Debian 13 | gnutls28 | 3.2.15-1 | — |
| Debian 12 | gnutls28 | 3.2.15-1 | — |
| Debian 7 | gnutls26 | 2.12.20-8+deb7u2 | DSA-2944-1 |
| Debian 6.0 | gnutls26 | 2.8.6-1+squeeze4 | DLA-0001-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | gnutls26 | 2.12.23-12ubuntu2.1 | USN-2229-1 |
| Ubuntu 14.04 LTS | gnutls28 | 3.2.11-2ubuntu1.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | gnutls +4 | 3.1.18-9.el7_0 | RHSA-2014:0684 |
| RHEL 6 | gnutls +3 | 2.8.5-14.el6_5 | RHSA-2014:0595 |
| RHEL 6 | rhev-hypervisor6 | 6.5-20140624.0.el6ev | RHSA-2014:0815 |
| RHEL 5 | gnutls +2 | 1.4.1-16.el5_10 | RHSA-2014:0594 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.4.15-1.1 | openSUSE-SU-2024:10105-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | gnutls +4 | 3.1.18-9.el7_0 | ELSA-2014-0684 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
azet/CVE-2014-3466_PoC ★ 17 · Jun 1, 2014
Proof of Concept for CVE-2014-3466 (GnuTLS buffer overflow: session id length check)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 9
- RHSA-2014:0815 Red Hat Security Advisory: rhev-hypervisor6 security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0684 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0595 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0594 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-2229-1 gnutls26 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-2944-1 gnutls26 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-0001-1 gnutls26 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10105-1 gnutls-3.4.15-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2014-0684 Important: gnutls security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 23, 2014
References
- http://www.gnutls.org/security.html
- http://www-01.ibm.com/support/docview.wss?uid=swg21678776
- DSA-2944 vendor-advisory
- 58340 third-party-advisory
- RHSA-2014:0595 vendor-advisory
- USN-2229-1 vendor-advisory
- 58642 third-party-advisory
- 67741 vdb-entry
- http://www.novell.com/support/kb/doc.php?id=7015302
- 59057 third-party-advisory
- http://linux.oracle.com/errata/ELSA-2014-0595.html
- 59086 third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1101932
- SUSE-SU-2014:0758 vendor-advisory
- RHSA-2014:0684 vendor-advisory
- openSUSE-SU-2014:0763 vendor-advisory
- 59021 third-party-advisory
- RHSA-2014:0815 vendor-advisory
- http://radare.today/technical-analysis-of-the-gnutls-hello-vulnerability/
- http://www.novell.com/support/kb/doc.php?id=7015303
- http://linux.oracle.com/errata/ELSA-2014-0594.html
- 58598 third-party-advisory
- http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5096155
- 59838 third-party-advisory
- SUSE-SU-2014:0788 vendor-advisory
- 60384 third-party-advisory
- RHSA-2014:0594 vendor-advisory
- 59016 third-party-advisory
- openSUSE-SU-2014:0767 vendor-advisory
- 58601 third-party-advisory
- 59408 third-party-advisory
- https://www.gitorious.org/gnutls/gnutls/commit/688ea6428a432c39203d00acd1af0e7684e5ddfd
- 1030314 vdb-entry