CVE-2020-29551: An issue was discovered in URVE Build 24.03.2020

This week

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2020-29551 is a critical-severity flaw (CVSS 9.1) affecting urve. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in URVE Build 24.03.2020. Using the _internal/pc/shutdown.php path, it is possible to shutdown the system. Among others, the following files and scripts are also accessible: _internal/pc/abort.php, _internal/pc/restart.php, _internal/pc/vpro.php, _internal/pc/wake.php, _internal/error_u201409.txt, _internal/runcmd.php, _internal/getConfiguration.php, ews/autoload.php, ews/del.php, ews/mod.php, ews/sync.php, utils/backup/ba

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	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-306
Published	2020-12-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: urve

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

Am I affected?

Timeline

2020-12-23 16:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

urve urve DOWNGRADE

Affected: 24.03.2020

Fixed in: no fixed release known

Safe to downgrade to: a release before 24.03.2020

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 24.03.2020 (Debian / Ubuntu)

apt-cache madison urve sudo apt install urve=<VERSION_BEFORE_24.03.2020> sudo apt-mark hold urve

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

dnf --showduplicates list urve sudo dnf downgrade urve-<VERSION_BEFORE_24.03.2020> sudo dnf versionlock add urve

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-2020-29551?

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

Is CVE-2020-29551 being exploited?

CVE-2020-29551 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-2020-29551 affect?

CVE-2020-29551 affects urve. Severity is critical (CVSS 9.1). An issue was discovered in URVE Build 24.03.2020. Using the _internal/pc/shutdown.php path, it is possible to shutdown the system. Among others, the following files and scripts are also accessible: _internal/pc/abort.php, _internal/pc/resta

How urgent is CVE-2020-29551?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-29552 CRITICAL 9.8 DOWNGRADE An issue was discovered in URVE Build 24.03.2020
CVE-2020-29550 HIGH 7.5 DOWNGRADE An issue was discovered in URVE Build 24.03.2020

References

← Back to latest CVEs