CVE-2021-47702: OpenBMCS 2.4 contains a CSRF vulnerability that allows attackers to perform actions with administrative privil

Routine

MEDIUM 4.3DOWNGRADE

CVE-2021-47702 is a medium-severity flaw (CVSS 4.3) affecting openbmcs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenBMCS 2.4 contains a CSRF vulnerability that allows attackers to perform actions with administrative privileges by exploiting the sendFeedback.php endpoint. Attackers can submit malicious requests to trigger unintended actions, such as sending emails or modifying system settings.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-352
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-2021-47702?

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

Is CVE-2021-47702 being exploited?

CVE-2021-47702 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-2021-47702 affect?

CVE-2021-47702 affects openbmcs. Severity is medium (CVSS 4.3). OpenBMCS 2.4 contains a CSRF vulnerability that allows attackers to perform actions with administrative privileges by exploiting the sendFeedback.php endpoint. Attackers can submit malicious requests to trigger unintended actions, such as s

How urgent is CVE-2021-47702?

Priority 22/100. Public exploit reference

Software pages

PHP vulnerabilities

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-2021-47703 HIGH 7.2 DOWNGRADE OpenBMCS 2.4 contains an unauthenticated SSRF vulnerability that allows attackers to bypass firewalls and init
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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