CVE-2026-35903Network attack vector

RTSP control bypass via unchecked Digest response

Published Apr 27, 2026 · Updated Apr 27, 2026

Authentication bypass in MERCURY MIPC252W firmware 1.0.5 Build 230306 Rel.79931n allows remote attackers to issue RTSP control commands. The RTSP service validates Digest authentication for the initial DESCRIBE request but does not verify the response value on later SETUP, PLAY, or TEARDOWN requests. Network access and nonce and session values from a previously authenticated session are required; reused values permit stream control without a valid Digest response.

CVSS severity9.8
Critical
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in MERCURY MIPC252W firmware 1.0.5 Build 230306 Rel.79931n allows remote attackers to issue RTSP control commands. The RTSP service validates Digest authentication for the initial DESCRIBE request but does not verify the response value on later SETUP, PLAY, or TEARDOWN requests. Network access and nonce and session values from a previously authenticated session are required; reused values permit stream control without a valid Digest response.

The record

CVE
CVE-2026-35903
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

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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