CVE-2021-47703Public exploitNetwork attack vector

Unauthenticated internal network probing via unvalidated ip parameter

Published Dec 9, 2025 · Updated Apr 7, 2026

SSRF in /php/query.php in OPEN BMCS OpenBMCS 2.4 allows remote attackers to contact arbitrary hosts via crafted POST requests. The endpoint uses the unvalidated ip parameter as a destination host and port for a server-side HTTP request, defaulting to port 81. No authentication is required, enabling internal service and network enumeration and hijacking of an active user's session.

CVSS severity7.2
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

SSRF in /php/query.php in OPEN BMCS OpenBMCS 2.4 allows remote attackers to contact arbitrary hosts via crafted POST requests. The endpoint uses the unvalidated ip parameter as a destination host and port for a server-side HTTP request, defaulting to port 81. No authentication is required, enabling internal service and network enumeration and hijacking of an active user's session.

The record

CVE
CVE-2021-47703
Published
Dec 9, 2025
Updated
Apr 7, 2026
Vendor
OPEN BMCS
Product
OpenBMCS
Classifications
CWE-918, T1046
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OPEN BMCS · OpenBMCSversion=2.4

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
7.2NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo