Is CVE-2021-45338 in the CISA KEV catalog?

No. CVE-2021-45338 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-45338?

CVE-2021-45338 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-45338?

CVE-2021-45338 has an EPSS score of 0.38% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-45338?

Upgrade antivirus to 20.4 or later.

CVE & CISA-KEV Catalog

CVE-2021-45338

HIGH

7.8

CVSS v3

NVD

Description

Multiple privilege escalation vulnerabilities in Avast Antivirus prior to 20.4 allow a local user to gain elevated privileges by calling unnecessarily powerful internal methods of the main antivirus service which could lead to the (1) arbitrary file delete, (2) write and (3) reset security.

How to fix

Remediation Available

antivirusNVD

Affected:< 20.4Fixed in:20.4CVE-2021-45338derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.38%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Exploit3

Vendor Advisory1

avast.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.