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CVE-2021-27241

21
FAUCET Score

CVE-2021-27241 is a local privilege escalation vulnerability affecting Avast Premium Security 20.8.2429. It allows a low-privileged attacker to delete arbitrary directories on the system by abusing the AvastSvc.exe module through a directory junction. The vulnerability has a CVSS score of 6.1 (Medium), indicating a local attack vector, low attack complexity, and a high impact on availability (denial-of-service). There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
20.8.2429CPE matchmatch criteria
cpe:2.3:a:avast:premium_security:20.8.2429:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
4.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.26%
Probability of exploitation in next 30 days
EPSS Percentile
17.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0026 is in the 72nd percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

zerodayinitiative.com / advisories/ZDI-21-208
Third Party AdvisoryVDB Entry