CVE-2021-25856: An issue was discovered in pcmt superMicro-CMS version 3.11, allows attackers to delete files via crafted imag

Routine

MEDIUM 4.9DOWNGRADE

CVE-2021-25856 is a medium-severity flaw (CVSS 4.9) affecting supermicro-cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in pcmt superMicro-CMS version 3.11, allows attackers to delete files via crafted image file in images.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Published	2023-08-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: supermicro-cms project

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

Am I affected?

Timeline

2023-08-11 14:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

supermicro-cms project supermicro-cms DOWNGRADE

Affected: 3.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.11

1. Check installed version

apt-cache policy supermicro-cms || rpm -q supermicro-cms || supermicro-cms --version

2. No fixed release: DOWNGRADE to a release before 3.11 (Debian / Ubuntu)

apt-cache madison supermicro-cms sudo apt install supermicro-cms=<VERSION_BEFORE_3.11> sudo apt-mark hold supermicro-cms

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

dnf --showduplicates list supermicro-cms sudo dnf downgrade supermicro-cms-<VERSION_BEFORE_3.11> sudo dnf versionlock add supermicro-cms

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-2021-25856?

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

Is CVE-2021-25856 being exploited?

CVE-2021-25856 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-2021-25856 affect?

CVE-2021-25856 affects supermicro-cms. Severity is medium (CVSS 4.9). An issue was discovered in pcmt superMicro-CMS version 3.11, allows attackers to delete files via crafted image file in images.php.

How urgent is CVE-2021-25856?

Priority 34/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-25857 HIGH 7.2 DOWNGRADE An issue was discovered in pcmt superMicro-CMS version 3.11, allows authenticated attackers to execute arbitra

References

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