CVE-2021-36773
HIGH
7.5
CVSS Score
Published: July 18, 2021 at 03:34 AM UTC
Updated: June 17, 2026 at 03:59 AM UTC
4 products affected across 4 vendorsDebian LinuxUblockoriginNmatrix
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Severity
HIGH7.5
Exploit prediction
EPSS 1%
Description
uBlock Origin before 1.36.2 and nMatrix before 4.4.9 support an arbitrary depth of parameter nesting for strict blocking, which allows crafted web sites to cause a denial of service (unbounded recursion that can trigger memory consumption and a loss of all blocking functionality).
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Debian Linux· Debiandrupal
95%v < 4.4.9
Affected range stops below 4.4.9, so it looks safe — our inference, not a vendor statement
v < 1.36.2
Affected range stops below 1.36.2, so it looks safe — our inference, not a vendor statement
v < 1.4.2
Affected range stops below 1.4.2, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (3)
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/vtriolet/writings/blob/main/posts/2021/ublock_origin_and_umatrix_denial_of_service.adocMailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/06/msg00024.htmlx_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://news.ycombinator.com/item?id=27833752CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-674
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