CVE-2021-28130: Dr.Web Firewall 12.5.2.4160 on Windows incorrectly restricts applications signed by Dr.Web

This month

HIGH 7.8DOWNGRADE

CVE-2021-28130 is a high-severity flaw (CVSS 7.8) affecting security space. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Dr.Web Firewall 12.5.2.4160 on Windows incorrectly restricts applications signed by Dr.Web. A DLL for a custom payload within a legitimate binary (e.g., frwl_svc.exe) bypasses firewall filters.

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	None
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-427
Published	2021-09-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: drweb

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

Am I affected?

Timeline

2021-09-24 16:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

drweb security space DOWNGRADE

Affected: 12.5.2.4160

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.5.2.4160

1. Check installed version

apt-cache policy security-space || rpm -q security-space || security-space --version

2. No fixed release: DOWNGRADE to a release before 12.5.2.4160 (Debian / Ubuntu)

apt-cache madison security-space sudo apt install security-space=<VERSION_BEFORE_12.5.2.4160> sudo apt-mark hold security-space

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

dnf --showduplicates list security-space sudo dnf downgrade security-space-<VERSION_BEFORE_12.5.2.4160> sudo dnf versionlock add security-space

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-2021-28130?

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

Is CVE-2021-28130 being exploited?

CVE-2021-28130 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-2021-28130 affect?

CVE-2021-28130 affects security space. Severity is high (CVSS 7.8). Dr.Web Firewall 12.5.2.4160 on Windows incorrectly restricts applications signed by Dr.Web. A DLL for a custom payload within a legitimate binary (e.g., frwl_svc.exe) bypasses firewall filters.

How urgent is CVE-2021-28130?

Priority 40/100. High severity; Public exploit reference

Software pages

Windows vulnerabilities

Related CVEs

CVE-2020-23967 HIGH 7.8 DOWNGRADE Dr.Web Security Space versions 11 and 12 allow elevation of privilege for local users without administrative p

References

← Back to latest CVEs