CVE-2018-10657
CVSS v3
7.5
HIGH
EPSS Score
1.5 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.
Technical details
- Published
- 2018-05-02
Frequently asked questions
What is CVE-2018-10657?
Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.
Is CVE-2018-10657 actively exploited?
Active exploitation of CVE-2018-10657 has not been confirmed. Its EPSS score was 1.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2018-10657?
CVE-2018-10657 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2018-10657 affecting your environment?
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