GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.
CVSS Score
7.4
EPSS Score
0.275
Published
2020-04-03
GnuTLS before 3.3.13 does not validate that the signature algorithms match when importing a certificate.
CVSS Score
7.5
EPSS Score
0.004
Published
2020-01-27
GnuTLS incorrectly validates the first byte of padding in CBC modes
CVSS Score
5.9
EPSS Score
0.011
Published
2019-12-20
It was discovered in gnutls before version 3.6.7 upstream that there is an uninitialized pointer access in gnutls versions 3.6.3 or later which can be triggered by certain post-handshake messages.
CVSS Score
5.9
EPSS Score
0.005
Published
2019-04-01
A vulnerability was found in gnutls versions from 3.5.8 before 3.6.7. A memory corruption (double free) vulnerability in the certificate verification API. Any client or server application that verifies X.509 certificates with GnuTLS 3.5.8 or later is affected.
CVSS Score
5.3
EPSS Score
0.026
Published
2019-03-27
A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the victim process, could use this to extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.
CVSS Score
4.7
EPSS Score
0.001
Published
2018-12-03
It was found that the GnuTLS implementation of HMAC-SHA-256 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data using crafted packets.
CVSS Score
5.9
EPSS Score
0.004
Published
2018-08-22
It was found that the GnuTLS implementation of HMAC-SHA-384 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plain text recovery attacks via statistical analysis of timing data using crafted packets.
CVSS Score
5.9
EPSS Score
0.008
Published
2018-08-22
A cache-based side channel in GnuTLS implementation that leads to plain text recovery in cross-VM attack setting was found. An attacker could use a combination of "Just in Time" Prime+probe attack in combination with Lucky-13 attack to recover plain text using crafted packets.
CVSS Score
5.3
EPSS Score
0.0
Published
2018-08-22
The "GNUTLS_KEYLOGFILE" environment variable in gnutls 3.4.12 allows remote attackers to overwrite and corrupt arbitrary files in the filesystem.
CVSS Score
7.5
EPSS Score
0.003
Published
2017-08-08