CVE-2017-5334

Double free vulnerability in the gnutls_x509_ext_import_proxy function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allows remote attackers to have unspecified impact via crafted policy language information in an X.509 certificate with a Proxy Certificate Information extension.

Published: 2017-03-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-5334 is rated High Risk (78.5/100): CVSS Critical severity, with high exploitation likelihood (EPSS 32.75%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +27.16% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-5334

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.59% 32.75% +27.16%
2 2025-11-21 6.90% 5.59% -1.31%
3 2025-11-18 — 6.90% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-5334

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2017-5334

OS Trackers for CVE-2017-5334

vendor priority summary link
debian not yet assigned CVE-2017-5334 not yet assigned priority: Debian including 1 source packages (gnutls28), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-5334
gentoo normal CVE-2017-5334: 1 GLSA(s) (201702-04), 1 atom(s) (net-libs/gnutls); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-5334
redhat medium — https://access.redhat.com/security/cve/CVE-2017-5334
suse medium CVE-2017-5334 severity moderate: SUSE including 17 source package names (gnutls, gnutls-3.3.26-9.el7, …), 38 product×package rows across 11 product lines (SUSE Liberty Linux 7, SUSE Linux Enterprise Desktop 12 SP1, … (11 product lines)): Known Not Affected 33, Fixed 5. https://www.suse.com/security/cve/CVE-2017-5334/
ubuntu medium CVE-2017-5334 medium priority: Ubuntu including 2 source packages (gnutls26, gnutls28), 20 status rows across 10 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, xenial, yakkety, zesty): DNE 8, released 8, not-affected 3, ignored 1. https://ubuntu.com/security/CVE-2017-5334

Affected software / configurations for CVE-2017-5334

Vendor Product Version Raw CPE
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
opensuse leap 42.2 cpe:2.3:o:opensuse:leap:42.2:*:*:*:*:*:*:*
gnu gnutls <= 3.3.25 cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*
gnu gnutls 3.5.0 cpe:2.3:a:gnu:gnutls:3.5.0:*:*:*:*:*:*:*
gnu gnutls 3.5.1 cpe:2.3:a:gnu:gnutls:3.5.1:*:*:*:*:*:*:*
gnu gnutls 3.5.2 cpe:2.3:a:gnu:gnutls:3.5.2:*:*:*:*:*:*:*
gnu gnutls 3.5.3 cpe:2.3:a:gnu:gnutls:3.5.3:*:*:*:*:*:*:*
gnu gnutls 3.5.4 cpe:2.3:a:gnu:gnutls:3.5.4:*:*:*:*:*:*:*
gnu gnutls 3.5.5 cpe:2.3:a:gnu:gnutls:3.5.5:*:*:*:*:*:*:*
gnu gnutls 3.5.6 cpe:2.3:a:gnu:gnutls:3.5.6:*:*:*:*:*:*:*
gnu gnutls 3.5.7 cpe:2.3:a:gnu:gnutls:3.5.7:*:*:*:*:*:*:*

References for CVE-2017-5334

cvelogic Threat Intelligence