8.8

CVE-2021-45335: avast antivirus Incorrect Default Permissions

CVSS: 8.8v3.1HighModified
Published 27-12-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-45335 is a high (CVSS 8.8) Incorrect Default Permissions vulnerability in avast antivirus. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
45/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.39%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 27-12-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Sandbox component in Avast Antivirus prior to 20.4 has an insecure permission which could be abused by local user to control the outcome of scans, and therefore evade detection or delete arbitrary system files.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

+0.01 pp

From 0.38% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.39%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Vulnerability Disclosures

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Avast1 product

1 vendor · 1 product

References

2 links