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CVE-2021-36773

uBlock Origin before 1.36.2 and nMatrix before 4.4.9 support an arbitrary depth of parameter...

7.5 HighFix available

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).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.26%Up 0.4 points since Jul 18, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

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).

Record
CVE-2021-36773
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-674
Updated
2026-11-02
CVE List No score

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).

Record
CVE-2021-36773
Updated
2026-11-02
EUVDEUVD-2021-23361 No score

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).

Record
EUVD-2021-23361
Updated
2026-11-03
GitHub AdvisoriesGHSA-vgm6-c9jx-rm2c 7.5

uBlock Origin before 1.36.2 and nMatrix before 4.4.9 support an arbitrary depth of parameter...

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).

Record
GHSA-vgm6-c9jx-rm2c
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-674
Updated
2026-11-02
OSV 7.5

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).

Record
CVE-2021-36773
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-36773 7.5

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).

Record
DEBIAN-CVE-2021-36773
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-36773 7.5

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).

Record
UBUNTU-CVE-2021-36773
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ublock-origin
Debian:12
 before 1.37.0+dfsg-1
1.37.0+dfsg-1
ublock-origin
Debian:13
 before 1.37.0+dfsg-1
1.37.0+dfsg-1
ublock-origin
Debian:14
 before 1.37.0+dfsg-1
1.37.0+dfsg-1
ublock-origin
Debian:9
 before 1.42.0+dfsg-1~deb9u1, plus listed versions
1.10.4+dfsg-11.11.4+dfsg-11.11.4+dfsg-21.12.4+dfsg-11.13.6+dfsg-1
Show 35 moreShow less
1.13.8+dfsg-11.16.14+dfsg-11.16.14+dfsg-1~deb9u11.16.14+dfsg-21.16.14+dfsg-2~deb9u11.16.6+dfsg-11.16.6+dfsg-1.11.17.0+dfsg-11.17.0+dfsg-21.17.0+dfsg-31.18.10+dfsg-11.18.2+dfsg-11.18.2+dfsg-21.18.4+dfsg-11.18.4+dfsg-21.19.0+dfsg-11.19.0+dfsg-21.22.2+dfsg-11.22.2+dfsg-1~deb10u11.22.2+dfsg-1~deb9u11.22.2+dfsg-21.25.0+dfsg-11.28.0+dfsg-11.29.0+dfsg-11.29.0+dfsg-21.30.0+dfsg-11.30.0+dfsg-1~deb10u11.32.0+dfsg-11.33.0+dfsg-11.37.0+dfsg-11.37.0+dfsg-1~deb10u11.37.0+dfsg-1~deb11u11.39.0+dfsg-11.39.0+dfsg-21.40.2+dfsg-1
1.42.0+dfsg-1~deb9u1
ublock-origin
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.5.6+dfsg-11.6.0+dfsg-11.6.6+dfsg-1
 None known
ublock-origin
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.13.8+dfsg-1
 None known
ublock-origin
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.19.0+dfsg-21.22.2+dfsg-1
 None known
umatrix
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.3.16+dfsg-2
 None known
ublock-origin
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.33.0+dfsg-1build11.37.0+dfsg-11.39.0+dfsg-21.40.2+dfsg-1
 None known
umatrix
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.4.0+dfsg-1
 None known
ublock-origin
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.51.0+dfsg-21.52.0+dfsg-11.53.3rc0+dfsg-11.54.0+dfsg-11.55.0+dfsg-1
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-36773 is a high vulnerability (CVSS 7.5) in Sciruby Nmatrix, published July 18, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.26%, the 69th percentile. Fixed in ublock-origin 1.37.0+dfsg-1.

References

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