CVE-2021-22327 [Medium] | Out-of-bounds Write in P30 Firmware

There is an arbitrary memory write vulnerability in Huawei smart phone when processing file parsing. Due to insufficient validation of the input files, successful exploit could cause certain service abnormal. Affected product versions include:HUAWEI P30 versions 10.0.0.186(C10E7R5P1), 10.0.0.186(C461E4R3P1), 10.0.0.188(C00E85R2P11), 10.0.0.188(C01E88R2P11),10.0.0.188(C605E19R1P3), 10.0.0.190(C185E4R7P1), 10.0.0.190(C431E22R2P5), 10.0.0.190(C432E22R2P5),10.0.0.190(C605E19R1P3), 10.0.0.190(C636E4R3P4), 10.0.0.192(C635E3R2P4).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.16%	0.53%	+0.37%
2	2025-03-30	0.25%	0.16%	-0.09%
3	2025-03-29	—	0.25%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.16%

0.53%

+0.37%

2025-03-30

0.25%

0.16%

-0.09%

2025-03-29

—

0.25%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	3.6	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

3.6

[email protected]

4.3

2.0

MEDIUM

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

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

2.9

[email protected]

Affected software / configurations for CVE-2021-22327

Vendor	Product	Version	Raw CPE
huawei	p30_firmware	10.0.0.186\(c10e7r5p1\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.186\(c10e7r5p1\):::::::*
huawei	p30_firmware	10.0.0.186\(c461e4r3p1\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.186\(c461e4r3p1\):::::::*
huawei	p30_firmware	10.0.0.188\(c00e85r2p11\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.188\(c00e85r2p11\):::::::*
huawei	p30_firmware	10.0.0.188\(c01e88r2p11\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.188\(c01e88r2p11\):::::::*
huawei	p30_firmware	10.0.0.188\(c605e19r1p3\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.188\(c605e19r1p3\):::::::*
huawei	p30_firmware	10.0.0.190\(c185e4r7p1\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.190\(c185e4r7p1\):::::::*
huawei	p30_firmware	10.0.0.190\(c431e22r2p5\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.190\(c431e22r2p5\):::::::*
huawei	p30_firmware	10.0.0.190\(c432e22r2p5\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.190\(c432e22r2p5\):::::::*
huawei	p30_firmware	10.0.0.190\(c605e19r1p3\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.190\(c605e19r1p3\):::::::*
huawei	p30_firmware	10.0.0.190\(c636e4r3p4\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.190\(c636e4r3p4\):::::::*
huawei	p30_firmware	10.0.0.192\(c635e3r2p4\)	cpe:2.3:o:huawei:p30_firmware:10.0.0.192\(c635e3r2p4\):::::::*

References for CVE-2021-22327

URL	Tags
https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20210331-01-smartphone-en	Vendor Advisory

URL

CVE-2021-22327

Exploit prediction scoring system (EPSS) score for CVE-2021-22327

Common vulnerability scoring system (CVSS) metrics for CVE-2021-22327

Weakness enumeration for CVE-2021-22327

Affected software / configurations for CVE-2021-22327

References for CVE-2021-22327