HIGH
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
Published May 2, 2018
7.5
HIGHCVSS 3.0
EPSS 1.52%
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.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.52% 0.01522
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.01522
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.52% (0.01522) | 73.71th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.52% (0.01522) | 73.48th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.10% (0.00101) | 41.93th | v3 (v2023.03.01) |
| May 22, 2024 | 0.10% (0.00101) | 41.42th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.10% (0.00097) | 39.34th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.09% (0.00088) | 35.98th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00116) | 43.82th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.78% (0.00777) | 21.50th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.78% (0.00777) | 0.00th | v1 |
Weaknesses (1)
References (5)
- https://docs.google.com/document/d/1I3fi2S-XnpO45qrpCsowZv8P8dHcNZ4fsBsbOW7KABI/edit#heading=h.fj95ykuss7s1
- https://github.com/advisories/GHSA-vmcc-4p4x-x7wg Advisory
- https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb x_refsource_CONFIRMPatch
- https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1/ x_refsource_CONFIRMVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-10657
| Link | Providers | Tags |
|---|---|---|
| https://docs.google.com/document/d/1I3fi2S-XnpO45qrpCsowZv8P8dHcNZ4fsBsbOW7KABI/edit#heading=h.fj95ykuss7s1 | ||
| https://github.com/advisories/GHSA-vmcc-4p4x-x7wg | Advisory | |
| https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb | x_refsource_CONFIRMPatch | |
| https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1/ | x_refsource_CONFIRMVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-10657 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published May 2, 2018
Updated Sep 16, 2024
Reserved May 2, 2018
Link CVE-2018-10657
CISA Vulnrichment
GHSA-VMCC-4P4X-X7WG Updated n/a