CVE-2020-13540: An exploitable local privilege elevation vulnerability exists in the file system permissions of the Win-911 En

This month

HIGH 7.8DOWNGRADE

CVE-2020-13540 is a high-severity flaw (CVSS 7.8) affecting win-911. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable local privilege elevation vulnerability exists in the file system permissions of the Win-911 Enterprise V4.20.13 install directory via WIN-911 Account Change Utility. Depending on the vector chosen, an attacker can overwrite various executables which could lead to escalation of the privileges when executed.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-276
Published	2021-01-05
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: win911

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

Am I affected?

Timeline

2021-01-05 16:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

win911 win-911 DOWNGRADE

Affected: 4.20.13

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.20.13

1. Check installed version

apt-cache policy win-911 || rpm -q win-911 || win-911 --version

2. No fixed release: DOWNGRADE to a release before 4.20.13 (Debian / Ubuntu)

apt-cache madison win-911 sudo apt install win-911=<VERSION_BEFORE_4.20.13> sudo apt-mark hold win-911

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

dnf --showduplicates list win-911 sudo dnf downgrade win-911-<VERSION_BEFORE_4.20.13> sudo dnf versionlock add win-911

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-2020-13540?

win-911: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-13540 being exploited?

CVE-2020-13540 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-2020-13540 affect?

CVE-2020-13540 affects win-911. Severity is high (CVSS 7.8). An exploitable local privilege elevation vulnerability exists in the file system permissions of the Win-911 Enterprise V4.20.13 install directory via WIN-911 Account Change Utility. Depending on the vector chosen, an attacker can overwrite

How urgent is CVE-2020-13540?

Priority 44/100. High severity; Public exploit reference

Related CVEs

CVE-2020-13539 HIGH 7.8 DOWNGRADE An exploitable local privilege elevation vulnerability exists in the file system permissions of the Win-911 En

References

← Back to latest CVEs