CVE-2023-21405 [Medium] | Security Vulnerability in A1001 Firmware

Knud from Fraktal.fi has found a flaw in some Axis Network Door Controllers and Axis Network Intercoms when communicating over OSDP, highlighting that the OSDP message parser crashes the pacsiod process, causing a temporary unavailability of the door-controlling functionalities meaning that doors cannot be opened or closed. No sensitive or customer data can be extracted as the Axis device is not further compromised. Please refer to the Axis security advisory for more information, mitigation and affected products and software versions.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.13%	0.26%	+0.14%
2	2023-08-03	0.04%	0.13%	+0.08%
3	2023-07-25	—	0.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.13%

0.26%

+0.14%

2023-08-03

0.04%

0.13%

+0.08%

2023-07-25

—

0.04%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. 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: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]
6.5	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. 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: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]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

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

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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: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]

6.5

3.1

MEDIUM

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

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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: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]

Affected software / configurations for CVE-2023-21405

Vendor	Product	Version	Raw CPE
axis	a1001_firmware	<= 1.65.4	cpe:2.3:o:axis:a1001_firmware::::::::
axis	a1210_\(-b\)_firmware	>= 11.0, <= 11.6.16.0	cpe:2.3:o:axis:a1210_\(-b\)_firmware::::::::
axis	a1601_firmware	<= 1.84.4	cpe:2.3:o:axis:a1601_firmware::::::::
axis	a1601_firmware	>= 10.0, <= 10.12.171.0	cpe:2.3:o:axis:a1601_firmware::::::::
axis	a1601_firmware	>= 11.0, <= 11.6.16.0	cpe:2.3:o:axis:a1601_firmware::::::::
axis	a1610_\(-b\)_firmware	<= 10.12.171.0	cpe:2.3:o:axis:a1610_\(-b\)_firmware::::::::
axis	a1610_\(-b\)_firmware	>= 11.0, <= 11.6.16.0	cpe:2.3:o:axis:a1610_\(-b\)_firmware::::::::
axis	axis_os	<= 10.12.178	cpe:2.3:o:axis:axis_os::::::::
axis	axis_os	>= 11.0, <= 11.5.53	cpe:2.3:o:axis:axis_os::::::::

References for CVE-2023-21405

URL	Tags
https://www.axis.com/dam/public/7f/3a/ed/cve-2023-21405-en-US-407244.pdf	Vendor Advisory

URL

CVE-2023-21405 | Denial-of-Service vulnerability in Axis Network Door Controller's and Axis Network Intercom's OSDP communication

Exploit prediction scoring system (EPSS) score for CVE-2023-21405

Common vulnerability scoring system (CVSS) metrics for CVE-2023-21405

Weakness enumeration for CVE-2023-21405

Affected software / configurations for CVE-2023-21405

References for CVE-2023-21405