CVE-2024-9481: An out-of-bounds write in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/2024

Q: How do I fix CVE-2024-9481?

antivirus: upgrade to 24092400; antivirus: upgrade to 24092400. Exact commands for each OS are on this page.

Q: Is CVE-2024-9481 being exploited?

CVE-2024-9481 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-9481 affect?

CVE-2024-9481 affects antivirus, antivirus. Severity is medium (CVSS 5.1). An out-of-bounds write in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/2024 on MacOS allows a malformed eml file to crash the application during file processing.

Q: How urgent is CVE-2024-9481?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 5.1UPGRADEUPGRADE

CVE-2024-9481 is a medium-severity flaw (CVSS 5.1) affecting antivirus, antivirus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out-of-bounds write in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/2024 on MacOS allows a malformed eml file to crash the application during file processing.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.1 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-787
Published	2024-10-04
Last modified	2026-06-17

Publisher (CNA): NortonLifeLock Inc. · Vendor: avast · avg

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

Am I affected?

Timeline

2024-10-04 13:15 UTCPublished CVE record published
2026-06-17 08:24 UTCUpdated Record last modified

avast antivirus UPGRADE

Affected: < 24092400

Fixed in: 24092400

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy antivirus || rpm -q antivirus || antivirus --version

2. UPGRADE to 24092400 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade antivirus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade antivirus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

avg antivirus UPGRADE

Affected: < 24092400

Fixed in: 24092400

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy antivirus || rpm -q antivirus || antivirus --version

2. UPGRADE to 24092400 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade antivirus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade antivirus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2024-9481?

antivirus: upgrade to 24092400; antivirus: upgrade to 24092400. Exact commands for each OS are on this page.

Is CVE-2024-9481 being exploited?

CVE-2024-9481 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-2024-9481 affect?

CVE-2024-9481 affects antivirus, antivirus. Severity is medium (CVSS 5.1). An out-of-bounds write in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/2024 on MacOS allows a malformed eml file to crash the application during file processing.

How urgent is CVE-2024-9481?

Priority 19/100. No elevated risk signals yet.

Software pages

macOS vulnerabilities

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References

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