CVE-2021-47703: OpenBMCS 2.4 contains an unauthenticated SSRF vulnerability that allows attackers to bypass firewalls and init

This week

HIGH 7.2REMOTEDOWNGRADE

CVE-2021-47703 is a high-severity flaw (CVSS 7.2) affecting openbmcs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenBMCS 2.4 contains an unauthenticated SSRF vulnerability that allows attackers to bypass firewalls and initiate service and network enumeration on the internal network through the affected application, allowing hijacking of current sessions. Attackers can specify an external domain in the 'ip' parameter to force the application to make an HTTP request to an arbitrary destination host.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-918
Published	2025-12-09
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: openbmcs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-09 21:15 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

openbmcs openbmcs DOWNGRADE

Affected: 2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.4

1. Check installed version

apt-cache policy openbmcs || rpm -q openbmcs || openbmcs --version

2. No fixed release: DOWNGRADE to a release before 2.4 (Debian / Ubuntu)

apt-cache madison openbmcs sudo apt install openbmcs=<VERSION_BEFORE_2.4> sudo apt-mark hold openbmcs

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openbmcs sudo dnf downgrade openbmcs-<VERSION_BEFORE_2.4> sudo dnf versionlock add openbmcs

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-47703?

openbmcs: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-47703 being exploited?

CVE-2021-47703 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-47703 affect?

CVE-2021-47703 affects openbmcs. Severity is high (CVSS 7.2). OpenBMCS 2.4 contains an unauthenticated SSRF vulnerability that allows attackers to bypass firewalls and initiate service and network enumeration on the internal network through the affected application, allowing hijacking of current sessi

How urgent is CVE-2021-47703?

Priority 41/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-47718 HIGH 7.5 DOWNGRADE OpenBMCS 2.4 contains an information disclosure vulnerability that allows unauthenticated attackers to access
CVE-2021-47704 MEDIUM 6.5 DOWNGRADE OpenBMCS 2.4 contains an SQL injection vulnerability that allows authenticated attackers to manipulate databas
CVE-2021-47702 MEDIUM 4.3 DOWNGRADE OpenBMCS 2.4 contains a CSRF vulnerability that allows attackers to perform actions with administrative privil
CVE-2021-47701 HIGH 8.8 DOWNGRADE OpenBMCS 2.4 allows an attacker to escalate privileges from a read user to an admin user by manipulating permi

References

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