Vulnerability Details : CVE-2021-36773
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).
Vulnerability category: Denial of service
Exploit prediction scoring system (EPSS) score for CVE-2021-36773
Probability of exploitation activity in the next 30 days: 0.37%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 72 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-36773
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-36773
-
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-36773
-
https://news.ycombinator.com/item?id=27833752
uBlock Origin (and uMatrix) DoS with strict-blocking filter and crafted URL | Hacker NewsIssue Tracking;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2022/06/msg00024.html
[SECURITY] [DLA 3062-1] ublock-origin security updateMailing List;Third Party Advisory
-
https://github.com/vtriolet/writings/blob/main/posts/2021/ublock_origin_and_umatrix_denial_of_service.adoc
writings/ublock_origin_and_umatrix_denial_of_service.adoc at main · vtriolet/writings · GitHubExploit;Third Party Advisory
Products affected by CVE-2021-36773
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:sciruby:nmatrix:*:*:*:*:*:*:*:*
- cpe:2.3:a:ublockorigin:ublock_origin:*:*:*:*:*:*:*:*
- cpe:2.3:a:umatrix_project:umatrix:*:*:*:*:*:*:*:*