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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.26% probability · 68th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-674
- Affected
- sciruby/nmatrix · ublockorigin/ublock origin · umatrix project/umatrix · debian/debian linux
- Source
- cve@mitre.org
References
- https://github.com/vtriolet/writings/blob/main/posts/2021/ublock_origin_and_umatrix_denial_of_service.adocExploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/06/msg00024.htmlMailing List, Third Party Advisory
- https://news.ycombinator.com/item?id=27833752Issue Tracking, Third Party Advisory
- https://github.com/vtriolet/writings/blob/main/posts/2021/ublock_origin_and_umatrix_denial_of_service.adocExploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/06/msg00024.htmlMailing List, Third Party Advisory
- https://news.ycombinator.com/item?id=27833752Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.