synced 4 MIN AGO
01 Record

CVE-2023-0361

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a

HighPUBLISHEDCNA: redhat
CNA base score7.4 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
View raw JSON

02 Description

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.45% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 72.9% of scored records. A rank, not a probability.
NVD base score
7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-10-14.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-02-15 00:00Z3 YR AGO
Last updated
2026-10-14 19:28Z14 DAYS AGO
Reserved
2023-01-18
Assigning CNA
redhat
Record state
PUBLISHED
Severity
High (CVSS 7.4)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
Data version
5.2
Document digest
4c29d22a2e5cc9076158d4e1813456f2a6ce2a931f0fbae7e6147cc9341f4e59

05 Affected products

VendorProductVersionsPlatforms
n/agnutlsgnutls-3.7.6—

06 References

07 Fixed in

AlmaLinux 8

  • gnutls
    Fixed in 3.6.16-6.el8_7
  • gnutls-c++
    Fixed in 3.6.16-6.el8_7
  • gnutls-dane
    Fixed in 3.6.16-6.el8_7
  • gnutls-devel
    Fixed in 3.6.16-6.el8_7
  • gnutls-utils
    Fixed in 3.6.16-6.el8_7

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • gnutls
    Fixed in 3.7.6-18.el9_1
  • gnutls-c++
    Fixed in 3.7.6-18.el9_1
  • gnutls-dane
    Fixed in 3.7.6-18.el9_1
  • gnutls-devel
    Fixed in 3.7.6-18.el9_1
  • gnutls-utils
    Fixed in 3.7.6-18.el9_1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • gnutls
    Fixed in 3.6.16-6.el8_7
  • gnutls-c++
    Fixed in 3.6.16-6.el8_7
  • gnutls-dane
    Fixed in 3.6.16-6.el8_7
  • gnutls-devel
    Fixed in 3.6.16-6.el8_7
  • gnutls-utils
    Fixed in 3.6.16-6.el8_7

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • gnutls
    Fixed in 3.7.6-18.el9_1
  • gnutls-c++
    Fixed in 3.7.6-18.el9_1
  • gnutls-dane
    Fixed in 3.7.6-18.el9_1
  • gnutls-devel
    Fixed in 3.7.6-18.el9_1
  • gnutls-utils
    Fixed in 3.7.6-18.el9_1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • gnutls28
    Fixed in 3.7.8-5

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • gnutls28
    Fixed in 3.7.8-5

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • gnutls28
    Fixed in 3.7.8-5

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • gnutls28
    Fixed in 3.6.13-2ubuntu1.8

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • gnutls28
    Fixed in 3.7.3-4ubuntu1.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • gnutls28
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • gnutls28
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.