How severe is CVE-2017-5334?

CVE-2017-5334 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-5334 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 33% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-5334?

CVE-2017-5334 primarily affects Gnu Gnutls. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-5334?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-5334 published?

CVE-2017-5334 was published on 2017-03-24 and last updated on 2026-06-17.

CVE-2017-5334

CVE-2017-5334 is a critical-severity vulnerability in Gnu Gnutls with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 33% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-415.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 33% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-415
Affected product: Gnu Gnutls
Published: 2017-03-24
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2017-5334?: CVE-2017-5334 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-5334 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 33% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-5334?: CVE-2017-5334 primarily affects Gnu Gnutls. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-5334?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-5334 published?: CVE-2017-5334 was published on 2017-03-24 and last updated on 2026-06-17.

References

Affected products (11)

cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:42.2:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.0:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.2:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.3:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.4:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.5:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.6:*:*:*:*:*:*:*
cpe:2.3:a:gnu:gnutls:3.5.7:*:*:*:*:*:*:*

More vulnerabilities in Gnu Gnutls

CVE-2008-1948 — Critical (CVSS 10.0): The _gnutls_server_name_recv_params function in lib/ext_server_name.c in libgnutls in gnutls-serv in GnuTLS before…
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CVE-2021-20231 — Critical (CVSS 9.8): A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption…
CVE-2017-5337 — Critical (CVSS 9.8): Multiple heap-based buffer overflows in the read_attribute function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8…
CVE-2017-5336 — Critical (CVSS 9.8): Stack-based buffer overflow in the cdk_pk_get_keyid function in lib/opencdk/pubkey.c in GnuTLS before 3.3.26 and 3.5.x…
CVE-2009-3555 — Critical (CVSS 9.8): The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services…

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CVE-2020-37239 — Critical (CVSS 9.8): libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety…
CVE-2026-43011 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When…
CVE-2026-31609 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid double-free in…
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Browse all CWE-415 (Double Free) vulnerabilities →