CVE-2021-43650: WebRun 3.6.0.42 is vulnerable to SQL Injection via the P_0 parameter used to set the username during the login

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-43650 is a critical-severity flaw (CVSS 9.8) affecting webrun. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WebRun 3.6.0.42 is vulnerable to SQL Injection via the P_0 parameter used to set the username during the login process.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited
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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	6.2% (top 6%)
CISA exploited list	No
Weakness	CWE-89
Published	2022-03-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: softwell

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

Am I affected?

Timeline

2022-03-22 16:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

softwell webrun DOWNGRADE

Affected: 3.6.0.42

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.6.0.42

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.6.0.42 (Debian / Ubuntu)

apt-cache madison webrun sudo apt install webrun=<VERSION_BEFORE_3.6.0.42> sudo apt-mark hold webrun

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

dnf --showduplicates list webrun sudo dnf downgrade webrun-<VERSION_BEFORE_3.6.0.42> sudo dnf versionlock add webrun

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Webrun 3.6.0.42 - 'P_0' SQL Injection

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-2021-43650?

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

Is CVE-2021-43650 being exploited?

CVE-2021-43650 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-2021-43650 affect?

CVE-2021-43650 affects webrun. Severity is critical (CVSS 9.8). WebRun 3.6.0.42 is vulnerable to SQL Injection via the P_0 parameter used to set the username during the login process.

How urgent is CVE-2021-43650?

Priority 68/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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