9.8

CVE-2019-18835: matrix synapse

CVSS: 9.8v3.1CriticalModified
AliasesGHSA-cppw-2mf8-qpm5PYSEC-2019-186UBUNTU-CVE-2019-18835
Published 07-11-2019Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2019-18835 is a critical (CVSS 9.8) vulnerability in matrix synapse. EPSS estimates a 0.86% chance of exploitation in the next 30 days, higher than 57.9% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.86%
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-6076-1

Timeline

  1. 07-11-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.

CVSS metrics

6 scores · 4 sources · 3 versions

EPSS trend

Probability

0.86%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

0.00 pp

From 0.86% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.86%

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< 1.5.0-1
Matrix1 product
PyPI1 product
  • matrix-synapse< 1.5.0
Ubuntu1 product
  • matrix-synapse< 0.24.0+dfsg-1ubuntu0.1~esm1

4 vendors · 4 products

References

11 links
Show all 11 references