Local privelage escalation via COM hijacking

published 2024-10-03 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-46951

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits: 0; none known

The AVGUI.exe of AVG/Avast Antivirus before versions before 24.1 can allow a local attacker to escalate privileges via an COM hijack in a time-of-check to time-of-use (TOCTOU) when self protection is disabled.

Patch / fix

fixed in 1

avg avg_anti-virus 24.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-10-03)

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

AVG/Avast Antivirus
avg avg_anti-virus

Classification

Weakness

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

References

support.norton.com /sp/static/external/tools/security-advisories.html

Sources

CVE List CVE-2024-5803
NVD CVE-2024-5803

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary