CVE-2020-26890
Denial of service attack due to invalid JSON
7.5
HIGH
CVSS 3.1
EPSS 3.0%
描述
Matrix Synapse before 1.20.0 erroneously permits non-standard NaN, Infinity, and -Infinity JSON values in fields of m.room.member events, allowing remote attackers to execute a denial of service attack against the federation and common Matrix clients. If such a malformed event is accepted into the room's state, the impact is long-lasting and is not fixed by an upgrade to a newer version, requiring the event to be manually redacted instead. Since events are replicated to servers of other room members, the impact is not constrained to the server of the event sender.
如何修補 CVE-2020-26890
要修補 CVE-2020-26890,請將受影響套件升級到下列已修補版本。
- —升級至 1.20.0 或更新版本
CVE-2020-26890 正在被利用嗎?
低 — EPSS 為 3.0%,目前沒有觀察到大規模利用活動。
受影響套件(1)
- from 0, < 1.20.0
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |