Vulnerability · Published Jul 18, 2021 · Assigned by mitre
CVE-2021-36773
High 7.5
In plain English
A high-severity security flaw in the ublock-origin package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.3%top 30.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ublock-origin | 1.37.0+dfsg-1 | DEBIAN-CVE-2021-36773 |
| Debian:13 | ublock-origin | 1.37.0+dfsg-1 | DEBIAN-CVE-2021-36773 |
| Debian:14 | ublock-origin | 1.37.0+dfsg-1 | DEBIAN-CVE-2021-36773 |
| Ubuntu:22.04:LTS | ublock-origin | no fix listed | UBUNTU-CVE-2021-36773 |
| Ubuntu:24.04:LTS | ublock-origin | no fix listed | UBUNTU-CVE-2021-36773 |
| Ubuntu:22.04:LTS | umatrix | no fix listed | UBUNTU-CVE-2021-36773 |
Affected products (as reported)
References
- https://news.ycombinator.com/item?id=27833752 x_refsource_MISC
- https://github.com/vtriolet/writings/blob/main/posts/2021/ublock_origin_and_umatrix_denial_of_service.adoc x_refsource_MISC
- [debian-lts-announce] 20220629 [SECURITY] [DLA 3062-1] ublock-origin security update mailing-list, x_refsource_MLIST