5.3

CVE-2023-43796: fedoraproject fedora

CVSS: 5.3v3.1MediumModified
AliasesGHSA-mp92-3jfm-3575PYSEC-2023-230UBUNTU-CVE-2023-43796
Published 31-10-2023Last modified 13-02-2025
Open JSON

Vulnerability summary

CVE-2023-43796 is a medium (CVSS 5.3) vulnerability in fedoraproject fedora. EPSS estimates a 0.90% chance of exploitation in the next 30 days, higher than 58.9% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.90%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
USN-7444-1

Timeline

  1. 31-10-2023
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

Description

Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.90%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

0.00 pp

From 0.90% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.90%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • matrix-synapse< 1.95.1-1
Fedoraproject1 product
Matrix1 product
Matrix-org1 product
Opensuse1 product
  • matrix-synapse&distro=openSUSE Tumbleweed< 1.95.1-1.1
PyPI1 product
  • matrix-synapse< daec55e1fe120c564240c5386e77941372bf458f | < 1.95.1
Ubuntu1 product
  • matrix-synapse< 0.24.0+dfsg-1ubuntu0.1~esm4 | < 1.11.0-1ubuntu0.1~esm2 | < 1.53.0-1ubuntu0.1~esm2

7 vendors · 7 products

References

15 links
Show all 15 references