CVE-2021-37182

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-06-14 · updated 2026-06-17
Weakness: CWE-354

Description

A vulnerability has been identified in SCALANCE XM408-4C (All versions < V6.5), SCALANCE XM408-4C (L3 int.) (All versions < V6.5), SCALANCE XM408-8C (All versions < V6.5), SCALANCE XM408-8C (L3 int.) (All versions < V6.5), SCALANCE XM416-4C (All versions < V6.5), SCALANCE XM416-4C (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 1x230V (All versions < V6.5), SCALANCE XR524-8C, 1x230V (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 24V (All versions < V6.5), SCALANCE XR524-8C, 24V (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 2x230V (All versions < V6.5), SCALANCE XR524-8C, 2x230V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 1x230V (All versions < V6.5), SCALANCE XR526-8C, 1x230V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 24V (All versions < V6.5), SCALANCE XR526-8C, 24V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 2x230V (All versions < V6.5), SCALANCE XR526-8C, 2x230V (L3 int.) (All versions < V6.5), SCALANCE XR528-6M (All versions < V6.5), SCALANCE XR528-6M (2HR2) (All versions < V6.5), SCALANCE XR528-6M (2HR2, L3 int.) (All versions < V6.5), SCALANCE XR528-6M (L3 int.) (All versions < V6.5), SCALANCE XR552-12M (All versions < V6.5), SCALANCE XR552-12M (2HR2) (All versions < V6.5), SCALANCE XR552-12M (2HR2) (All versions < V6.5), SCALANCE XR552-12M (2HR2, L3 int.) (All versions < V6.5). The OSPF protocol implementation in affected devices fails to verify the checksum and length fields in the OSPF LS Update messages. An unauthenticated remote attacker could exploit this vulnerability to cause interruptions in the network by sending specially crafted OSPF packets. Successful exploitation requires OSPF to be enabled on an affected device.

Affected products

Siemens Scalance Xm408-4C Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xm408-4C L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xm408-8C Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xm408-8C L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xm416-4C Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xm416-4C L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr524-8C Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr524-8C L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr526-8C Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr526-8C L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr528-6M 2Hr2 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr528-6M 2Hr2 L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr528-6M Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr528-6M L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr552-12M 2Hr2 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr552-12M 2Hr2 L3 Firmware: before 6.5 — fixed in 6.5
Siemens Scalance Xr552-12M Firmware: before 6.5 — fixed in 6.5

How to fix

Upgrade to a fixed version: Siemens Scalance Xm408-4C Firmware 6.5; Siemens Scalance Xm408-4C L3 Firmware 6.5; Siemens Scalance Xm408-8C Firmware 6.5; Siemens Scalance Xm408-8C L3 Firmware 6.5; Siemens Scalance Xm416-4C Firmware 6.5; Siemens Scalance Xm416-4C L3 Firmware 6.5; Siemens Scalance Xr524-8C Firmware 6.5; Siemens Scalance Xr524-8C L3 Firmware 6.5; Siemens Scalance Xr526-8C Firmware 6.5; Siemens Scalance Xr526-8C L3 Firmware 6.5; Siemens Scalance Xr528-6M 2Hr2 Firmware 6.5; Siemens Scalance Xr528-6M 2Hr2 L3 Firmware 6.5. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-37182 or the next vulnerability affects your stack