CVE-2021-41729: BaiCloud-cms v2.5.7 is affected by an arbitrary file deletion vulnerability, which allows an attacker to delet

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CRITICAL 9.1REMOTEDOWNGRADE

CVE-2021-41729 is a critical-severity flaw (CVSS 9.1) affecting baicloud-cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

BaiCloud-cms v2.5.7 is affected by an arbitrary file deletion vulnerability, which allows an attacker to delete arbitrary files on the server through /user/ppsave.php.

Why this priority

Critical 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	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-862
Published	2021-09-30
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2021-09-30 11:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

baicloud-cms project baicloud-cms DOWNGRADE

Affected: 2.5.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.5.7 (Debian / Ubuntu)

apt-cache madison baicloud-cms sudo apt install baicloud-cms=<VERSION_BEFORE_2.5.7> sudo apt-mark hold baicloud-cms

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

dnf --showduplicates list baicloud-cms sudo dnf downgrade baicloud-cms-<VERSION_BEFORE_2.5.7> sudo dnf versionlock add baicloud-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-2021-41729?

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

Is CVE-2021-41729 being exploited?

CVE-2021-41729 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-2021-41729 affect?

CVE-2021-41729 affects baicloud-cms. Severity is critical (CVSS 9.1). BaiCloud-cms v2.5.7 is affected by an arbitrary file deletion vulnerability, which allows an attacker to delete arbitrary files on the server through /user/ppsave.php.

How urgent is CVE-2021-41729?

Priority 58/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-44302 HIGH 8.8 DOWNGRADE BaiCloud-cms v2.5.7 was discovered to contain multiple SQL injection vulnerabilities via the tongji and baidu_

References

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