How severe is CVE-2021-37182?

CVE-2021-37182 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-37182 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37182?

CVE-2021-37182 primarily affects Siemens Scalance Xm408-4c Firmware. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-37182?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-37182 published?

CVE-2021-37182 was published on 2022-06-14 and last updated on 2026-06-17.

CVE-2021-37182

CVE-2021-37182 is a high-severity vulnerability in Siemens Scalance Xm408-4c Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-354.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-354
Affected product: Siemens Scalance Xm408-4c Firmware
Published: 2022-06-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-37182?: 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.
How severe is CVE-2021-37182?: CVE-2021-37182 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-37182 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37182?: CVE-2021-37182 primarily affects Siemens Scalance Xm408-4c Firmware. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-37182?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-37182 published?: CVE-2021-37182 was published on 2022-06-14 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-145224.pdf

Affected products (29)

cpe:2.3:o:siemens:scalance_xm408-4c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xm408-4c_l3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xm408-8c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xm408-8c_l3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xm416-4c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xm416-4c_l3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr524-8c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr524-8c_firmware:*:*:*:*:*:*:1x230v:*
cpe:2.3:o:siemens:scalance_xr524-8c_firmware:*:*:*:*:*:*:24v:*
cpe:2.3:o:siemens:scalance_xr524-8c_firmware:*:*:*:*:*:*:2x230v:*
cpe:2.3:o:siemens:scalance_xr524-8c_l3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr524-8c_l3_firmware:*:*:*:*:*:*:1x230v:*
cpe:2.3:o:siemens:scalance_xr524-8c_l3_firmware:*:*:*:*:*:*:24v:*
cpe:2.3:o:siemens:scalance_xr524-8c_l3_firmware:*:*:*:*:*:*:2x230v:*
cpe:2.3:o:siemens:scalance_xr526-8c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr526-8c_firmware:*:*:*:*:*:*:1x230v:*
cpe:2.3:o:siemens:scalance_xr526-8c_firmware:*:*:*:*:*:*:24v:*
cpe:2.3:o:siemens:scalance_xr526-8c_firmware:*:*:*:*:*:*:2x230v:*
cpe:2.3:o:siemens:scalance_xr526-8c_l3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr526-8c_l3_firmware:*:*:*:*:*:*:1x230v:*
cpe:2.3:o:siemens:scalance_xr526-8c_l3_firmware:*:*:*:*:*:*:24v:*
cpe:2.3:o:siemens:scalance_xr526-8c_l3_firmware:*:*:*:*:*:*:2x230v:*
cpe:2.3:o:siemens:scalance_xr528-6m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr528-6m_2hr2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr528-6m_2hr2_l3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr528-6m_l3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr552-12m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr552-12m_2hr2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr552-12m_2hr2_l3_firmware:*:*:*:*:*:*:*:*

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