No exploitation reportedFix available

CVE-2021-27392

No exploitation reported by the sources we read.

Published2021-04-22
WeaknessCWE-321 · CWE-798

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2021-04-2221:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27392?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27392?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens siveillance video open network bridge

Branch	Affected	Fixed in	Source
2018.x	= 2018	no fix published	NVD
2019.x	= 2019	no fix published	NVD
2020.x	= 2020	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-103-15 CISA1 known affected
Siemens and Milestone Siveillance Video Open Network Bridge
Siveillance Video Open Network Bridge

Full record on NVD

Fix

Vendor fix CISA ICSA-21-103-15 · 1 productApply the hotfix using the latest available installer for Open Network Bridge
Vendor fix CISA ICSA-21-103-15 · 1 productApply the hotfix using the latest available installer for ONVIF Bridge
Mitigation from the vendor CISA ICSA-21-103-15 · 8 productsDisable the Open Network Bridge (ONVIF), if not in use. Note: By default the Open Network Bridge is disabled.

Advisories and patches

cert-portal.siemens.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.04read 2026-10-23
CNAweakness (CWE)CWE-321read 2026-10-23
NVDweakness (CWE)CWE-798read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2021-04-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-27392?

Is CVE-2021-27392 actively exploited?

Active exploitation of CVE-2021-27392 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27392?

CVE-2021-27392 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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