How severe is CVE-2021-27392?

CVE-2021-27392 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27392 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27392?

CVE-2021-27392 primarily affects Siemens Siveillance Video Open Network Bridge. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27392?

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-2021-27392 published?

CVE-2021-27392 was published on 2021-04-22 and last updated on 2026-06-17.

CVE-2021-27392

CVE-2021-27392 is a high-severity vulnerability in Siemens Siveillance Video Open Network Bridge with a CVSS 3.x base score of 8.8. 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-798.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 4.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Siemens Siveillance Video Open Network Bridge
Published: 2021-04-22
Last modified: 2026-06-17

Description

A vulnerability has been identified in Siveillance Video Open Network Bridge (2020 R3), Siveillance Video Open Network Bridge (2020 R2), Siveillance Video Open Network Bridge (2020 R1), Siveillance Video Open Network Bridge (2019 R3), Siveillance Video Open Network Bridge (2019 R2), Siveillance Video Open Network Bridge (2019 R1), Siveillance Video Open Network Bridge (2018 R3), Siveillance Video Open Network Bridge (2018 R2). Affected Open Network Bridges store user credentials for the authentication between ONVIF clients and ONVIF server using a hard-coded key. The encrypted credentials can be retrieved via the MIP SDK. This could allow an authenticated remote attacker to retrieve and decrypt all credentials stored on the ONVIF server.

Frequently asked questions

What is CVE-2021-27392?: A vulnerability has been identified in Siveillance Video Open Network Bridge (2020 R3), Siveillance Video Open Network Bridge (2020 R2), Siveillance Video Open Network Bridge (2020 R1), Siveillance Video Open Network Bridge (2019 R3), Siveillance Video Open Network Bridge (2019 R2), Siveillance Video Open Network Bridge (2019 R1), Siveillance Video Open Network Bridge (2018 R3), Siveillance Video Open Network Bridge (2018 R2). Affected Open Network Bridges store user credentials for the authentication between ONVIF clients and ONVIF server using a hard-coded key. The encrypted credentials can be retrieved via the MIP SDK. This could allow an authenticated remote attacker to retrieve and decrypt all credentials stored on the ONVIF server.
How severe is CVE-2021-27392?: CVE-2021-27392 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27392 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27392?: CVE-2021-27392 primarily affects Siemens Siveillance Video Open Network Bridge. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27392?: 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-2021-27392 published?: CVE-2021-27392 was published on 2021-04-22 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-853866.pdf

Affected products (8)

cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2018:r2:*:*:*:*:*:*
cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2018:r3:*:*:*:*:*:*
cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2019:r1:*:*:*:*:*:*
cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2019:r2:*:*:*:*:*:*
cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2019:r3:*:*:*:*:*:*
cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2020:r1:*:*:*:*:*:*
cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2020:r2:*:*:*:*:*:*
cpe:2.3:a:siemens:siveillance_video_open_network_bridge:2020:r3:*:*:*:*:*:*

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