CVE-2022-46353 [Critical] | Security Vulnerability in 6gk5204-0ba00-2mb2 Firmware

A vulnerability has been identified in SCALANCE X204RNA (HSR) (All versions < V3.2.7), SCALANCE X204RNA (PRP) (All versions < V3.2.7), SCALANCE X204RNA EEC (HSR) (All versions < V3.2.7), SCALANCE X204RNA EEC (PRP) (All versions < V3.2.7), SCALANCE X204RNA EEC (PRP/HSR) (All versions < V3.2.7). The webserver of affected devices calculates session ids and nonces in an insecure manner. This could allow an unauthenticated remote attacker to brute-force session ids and hijack existing sessions.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.99%	1.00%	-0.99%
2	2025-12-21	1.21%	1.99%	+0.78%
3	2025-12-17	—	1.21%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.99%

1.00%

-0.99%

2025-12-21

1.21%

1.99%

+0.78%

2025-12-17

—

1.21%

—

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]
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	134c704f-9b21-4f2e-91b3-4a467353bcc0

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]

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

134c704f-9b21-4f2e-91b3-4a467353bcc0

Affected software / configurations for CVE-2022-46353

Vendor	Product	Version	Raw CPE
siemens	6gk5204-0ba00-2mb2_firmware	< 3.2.7	cpe:2.3:o:siemens:6gk5204-0ba00-2mb2_firmware::::::::
siemens	6gk5204-0ba00-2kb2_firmware	< 3.2.7	cpe:2.3:o:siemens:6gk5204-0ba00-2kb2_firmware::::::::
siemens	6gk5204-0bs00-2na3_firmware	< 3.2.7	cpe:2.3:o:siemens:6gk5204-0bs00-2na3_firmware::::::::
siemens	6gk5204-0bs00-3la3_firmware	< 3.2.7	cpe:2.3:o:siemens:6gk5204-0bs00-3la3_firmware::::::::
siemens	6gk5204-0bs00-3pa3_firmware	< 3.2.7	cpe:2.3:o:siemens:6gk5204-0bs00-3pa3_firmware::::::::

References for CVE-2022-46353

URL	Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-363821.pdf	Patch Vendor Advisory

URL

CVE-2022-46353

Exploit prediction scoring system (EPSS) score for CVE-2022-46353

Common vulnerability scoring system (CVSS) metrics for CVE-2022-46353

Weakness enumeration for CVE-2022-46353

Affected software / configurations for CVE-2022-46353

References for CVE-2022-46353