CVE-2021-30474 [Critical] | Use-After-Free in Aomedia

CVE-2021-30474 is rated Moderate Risk (52.3/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.17%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	0.67%	0.17%	-0.50%
2	2025-11-18	0.17%	0.67%	+0.51%
3	2025-03-30	—	0.17%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

0.67%

0.17%

-0.50%

2025-11-18

0.17%

0.67%

+0.51%

2025-03-30

—

0.17%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

[email protected]

7.5

2.0

HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

OS Trackers for CVE-2021-30474

vendor	priority	summary	link
`alpine`	—	CVE-2021-30474: 1 source package rows (aom); 8 state rows across 8 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-community, edge-main); fixed 8, open 0.	https://security.alpinelinux.org/vuln/CVE-2021-30474
`debian`	not yet assigned	CVE-2021-30474 not yet assigned priority: Debian including 1 source packages (aom), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2021-30474
`gentoo`	normal	CVE-2021-30474: 1 GLSA(s) (202401-32), 1 atom(s) (media-libs/libaom); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-30474
`suse`	high	CVE-2021-30474 severity important: SUSE including 24 source package names (aom-tools-1.0.0-3.6.1, aom-tools-1.0.0-lp152.3.6.1, …), 36 product×package rows across 15 product lines (SUSE Linux Enterprise Module for Basesystem 15 SP4, SUSE Linux Enterprise Module for Basesystem 15 SP5, … (15 product lines)): Fixed 36.	https://www.suse.com/security/cve/CVE-2021-30474/
`ubuntu`	low	CVE-2021-30474 low priority: Ubuntu including 1 source packages (aom), 13 status rows across 13 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): ignored 5, not-affected 4, DNE 2, released 2.	https://ubuntu.com/security/CVE-2021-30474

Affected software / configurations for CVE-2021-30474

Vendor	Product	Version	Raw CPE
aomedia	aomedia	< 2021-03-30	cpe:2.3:a:aomedia:aomedia::::::::

References for CVE-2021-30474

URL	Tags
https://aomedia.googlesource.com/aom/+/6e31957b6dc62dbc7d1bb70cd84902dd14c4bf2e	Patch Third Party Advisory
https://bugs.chromium.org/p/aomedia/issues/detail?id=3000	Permissions Required Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00003.html
https://security.gentoo.org/glsa/202401-32
https://www.debian.org/security/2023/dsa-5490

URL

CVE-2021-30474

Exploit prediction scoring system (EPSS) score for CVE-2021-30474

Common vulnerability scoring system (CVSS) metrics for CVE-2021-30474

Weakness enumeration for CVE-2021-30474

OS Trackers for CVE-2021-30474

Affected software / configurations for CVE-2021-30474

References for CVE-2021-30474