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NVD / CVE Program· CNA redhat

CVE-2023-5981: Gnutls: timing side-channel in the rsa-psk authentication

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 69.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: CBL Mariner 2.0 ARM 3.7.11-1; CBL Mariner 2.0 x64 3.7.11-1.

Low priority for now. Upgrade to CBL Mariner 2.0 ARM 3.7.11-1; CBL Mariner 2.0 x64 3.7.11-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Nov 28, 2023
Updated
Oct 14, 2026
EPSS
1.2% · 69th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.2%

CNA vs NVD score

NVD
5.9
CNA · redhat
5.9
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
debiandebian linux
gnugnutls
redhatlinux
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • fedoraproject fedora37
  • fedoraproject fedora38
  • gnu gnutlsbefore 3.8.2
  • redhat linux8.0
  • redhat linux9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • 0:3.6.16-8.el8_9 and laternot affected · rpm
    • 0:3.6.16-8.el8_9 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support

    • 0:3.6.16-5.el8_6.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support

    • 0:3.6.16-7.el8_8.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:3.7.6-23.el9_3.3 and laternot affected · rpm
    • 0:3.7.6-23.el9_3.3 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support

    • 0:3.7.6-21.el9_2.1 and laternot affected · rpm

  • Red Hat RHODF-4.15-RHEL-9

    • v4.15.0-37 and laternot affected · rpm
    • v4.15.0-68 and laternot affected · rpm
    • v4.15.0-158 and laternot affected · rpm
    • v4.15.0-39 and laternot affected · rpm
    • v4.15.0-58 and laternot affected · rpm
    • v4.15.0-158 and laternot affected · rpm
    • v4.15.0-13 and laternot affected · rpm
    • v4.15.0-81 and laternot affected · rpm
    • v4.15.0-158 and laternot affected · rpm
    • v4.15.0-79 and laternot affected · rpm

  • Red Hat RHOL-5.8-RHEL-9

    • v5.8.6-22 and laternot affected · rpm
    • v5.8.6-11 and laternot affected · rpm
    • v6.8.1-407 and laternot affected · rpm
    • v5.8.6-19 and laternot affected · rpm
    • v1.0.0-479 and laternot affected · rpm
    • v5.8.6-7 and laternot affected · rpm
    • v0.4.0-247 and laternot affected · rpm
    • v5.8.6-5 and laternot affected · rpm
    • v1.1.0-227 and laternot affected · rpm
    • v5.8.1-470 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8gnutlsbefore 3.6.16-8.el8_9.13.6.16-8.el8_9.1
AlmaLinux:8gnutlsbefore 3.6.16-8.el8_93.6.16-8.el8_9
AlmaLinux:8gnutls-c++before 3.6.16-8.el8_93.6.16-8.el8_9
AlmaLinux:8gnutls-c++before 3.6.16-8.el8_9.13.6.16-8.el8_9.1
AlmaLinux:8gnutls-danebefore 3.6.16-8.el8_9.13.6.16-8.el8_9.1
AlmaLinux:8gnutls-danebefore 3.6.16-8.el8_93.6.16-8.el8_9
AlmaLinux:8gnutls-develbefore 3.6.16-8.el8_9.13.6.16-8.el8_9.1
AlmaLinux:8gnutls-develbefore 3.6.16-8.el8_93.6.16-8.el8_9
AlmaLinux:8gnutls-utilsbefore 3.6.16-8.el8_9.13.6.16-8.el8_9.1
AlmaLinux:8gnutls-utilsbefore 3.6.16-8.el8_93.6.16-8.el8_9
AlmaLinux:9gnutlsbefore 3.7.6-23.el9_3.33.7.6-23.el9_3.3
AlmaLinux:9gnutls-c++before 3.7.6-23.el9_3.33.7.6-23.el9_3.3
AlmaLinux:9gnutls-danebefore 3.7.6-23.el9_3.33.7.6-23.el9_3.3
AlmaLinux:9gnutls-develbefore 3.7.6-23.el9_3.33.7.6-23.el9_3.3
AlmaLinux:9gnutls-utilsbefore 3.7.6-23.el9_3.33.7.6-23.el9_3.3
Alpine:v3.18gnutlsbefore 3.8.3-r03.8.3-r0
Debian:10gnutls28before 3.6.7-4+deb10u113.6.7-4+deb10u11
Debian:12gnutls28before 3.7.9-2+deb12u13.7.9-2+deb12u1
Debian:13gnutls28before 3.8.2-13.8.2-1
openSUSE:Leap Micro 5.4gnutlsbefore 3.7.3-150400.4.38.13.7.3-150400.4.38.1
openSUSE:Tumbleweedgnutlsbefore 3.8.2-1.13.8.2-1.1
Red Hat:enterprise_linux:8::appstreamgnutls-c++before 0:3.6.16-8.el8_90:3.6.16-8.el8_9
Red Hat:enterprise_linux:8::appstreamgnutls-c++-debuginfobefore 0:3.6.16-8.el8_90:3.6.16-8.el8_9
Red Hat:enterprise_linux:8::appstreamgnutls-danebefore 0:3.6.16-8.el8_90:3.6.16-8.el8_9

+53

Same product

debian: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-9079A use-after-free vulnerability in SVG Animation has been discovered.KEV
    86Now
  • CVE-2024-44308The issue was addressed with improved checks.KEV
    68This week
  • CVE-2021-25216A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack
    64This week

Published before and after this one in the same product

  • ← EarlierCVE-2023-26604Mar 3, 2023 · systemd before 247 does not adequately block local privilege escalation for some Sudo configurations, e.g., plausible sudoers files in which
    31Monitor
  • ← EarlierCVE-2023-45133Oct 12, 2023 · Babel vulnerable to arbitrary code execution when compiling specifically crafted malicious code
    35Monitor
  • Later →CVE-2024-22049Jan 4, 2024 · httparty Multipart/Form-Data Request Tampering Vulnerability
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
CBL Mariner 2.0 ARM3.7.11-1 · gnutlsMicrosoft (MSRC)
CBL Mariner 2.0 x643.7.11-1 · gnutlsMicrosoft (MSRC)
almalinux:gnutls3.6.16-8.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:gnutls-c++3.6.16-8.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:gnutls-dane3.6.16-8.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:gnutls-devel3.6.16-8.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:gnutls-utils3.6.16-8.el8_9 · AlmaLinux:8Package registry (OSV)
alpine:gnutls3.8.3-r0 · Alpine:v3.18Package registry (OSV)
debian:gnutls283.7.9-2+deb12u1 · Debian:12Package registry (OSV)
opensuse:gnutls3.7.3-150400.4.38.1 · openSUSE:Leap Micro 5.4Package registry (OSV)
red hat:gnutls0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:gnutls-c++0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-c++-debuginfo0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-dane0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-dane-debuginfo0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-debuginfo0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-debugsource0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-devel0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-utils0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-utils-debuginfo0:3.6.16-8.el8_9 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:gnutls0:3.6.16-8.el8_9 · Rocky Linux:8Package registry (OSV)
suse:gnutls3.6.7-150000.6.50.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:gnutls3.7.3-150400.4.38.1 · SUSE:Linux Enterprise Micro 5.4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-208 · Observable Timing Discrepancy

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (14 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records