CVE-2021-27392Network attack vector

Credential disclosure via hard-coded encryption key

Published Apr 22, 2021 · Updated Aug 3, 2024

Credential disclosure in Siemens Siveillance Video Open Network Bridge allows remote authenticated users to decrypt stored ONVIF credentials. The bridge encrypts ONVIF client-to-server credentials with a hard-coded key and exposes the resulting ciphertext through the MIP SDK. Remote authenticated users with MIP SDK access can recover every credential stored by affected 2018 R2 through 2020 R3 servers.

CVSS severity8.8
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential disclosure in Siemens Siveillance Video Open Network Bridge allows remote authenticated users to decrypt stored ONVIF credentials. The bridge encrypts ONVIF client-to-server credentials with a hard-coded key and exposes the resulting ciphertext through the MIP SDK. Remote authenticated users with MIP SDK access can recover every credential stored by affected 2018 R2 through 2020 R3 servers.

The record

CVE
CVE-2021-27392
Published
Apr 22, 2021
Updated
Aug 3, 2024
Vendor
Siemens
Product
Siveillance Video Open Network Bridge
Classifications
CWE-798, CWE-321, T1555
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2018 R2
  2. Affected versionversion=2018 R3
  3. Affected versionversion=2019 R1
  4. Affected versionversion=2019 R2
  5. Affected versionversion=2019 R3
  6. Affected versionversion=2020 R1
  7. Affected versionversion=2020 R2
  8. Affected versionversion=2020 R3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · Siveillance Video Open Network Bridgeversion=2018 R2; version=2018 R3; version=2019 R1; version=2019 R2; version=2019 R3; version=2020 R1; version=2020 R2; version=2020 R3

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
CWE-321Use of Hard-coded Cryptographic Key
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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