CVE-2022-21147: An out of bounds read vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.7.7

Routine

MEDIUM 5.5DOWNGRADE

CVE-2022-21147 is a medium-severity flaw (CVSS 5.5) affecting alyac. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out of bounds read vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.7.7. A specially-crafted PE file can trigger this vulnerability to cause denial of service and termination of malware scan. An attacker can provide a malicious file to trigger this vulnerability.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-823, CWE-125
Published	2022-05-12
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: estsoft

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

Am I affected?

Timeline

2022-05-12 17:15 UTCPublished CVE record published
2026-06-17 04:25 UTCUpdated Record last modified

estsoft alyac DOWNGRADE

Affected: 2.5.7.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5.7.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.5.7.7 (Debian / Ubuntu)

apt-cache madison alyac sudo apt install alyac=<VERSION_BEFORE_2.5.7.7> sudo apt-mark hold alyac

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list alyac sudo dnf downgrade alyac-<VERSION_BEFORE_2.5.7.7> sudo dnf versionlock add alyac

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-21147?

alyac: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-21147 being exploited?

CVE-2022-21147 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-2022-21147 affect?

CVE-2022-21147 affects alyac. Severity is medium (CVSS 5.5). An out of bounds read vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.7.7. A specially-crafted PE file can trigger this vulnerability to cause denial of service and termination of malware scan. An attacker can pr

How urgent is CVE-2022-21147?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2022-43665 MEDIUM 5.5 DOWNGRADE A denial of service vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.8.645
CVE-2022-32543 HIGH 7.8 DOWNGRADE An integer overflow vulnerability exists in the way ESTsoft Alyac 2.5.8.544 parses OLE files
CVE-2022-29886 HIGH 7.8 DOWNGRADE An integer overflow vulnerability exists in the way ESTsoft Alyac 2.5.8.544 parses OLE files

References

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