CVE-2022-43665: A denial of service vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.8.645

Routine

MEDIUM 5.5DOWNGRADE

CVE-2022-43665 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.

A denial of service vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.8.645. A specially-crafted PE file can lead to killing target process. 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	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-823
Published	2023-02-02
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

2023-02-02 10:15 UTCPublished CVE record published
2026-06-17 05:07 UTCUpdated Record last modified

estsoft alyac DOWNGRADE

Affected: 2.5.8.645

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5.8.645

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.5.8.645 (Debian / Ubuntu)

apt-cache madison alyac sudo apt install alyac=<VERSION_BEFORE_2.5.8.645> sudo apt-mark hold alyac

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

dnf --showduplicates list alyac sudo dnf downgrade alyac-<VERSION_BEFORE_2.5.8.645> 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-2022-43665?

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

Is CVE-2022-43665 being exploited?

CVE-2022-43665 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-2022-43665 affect?

CVE-2022-43665 affects alyac. Severity is medium (CVSS 5.5). A denial of service vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.8.645. A specially-crafted PE file can lead to killing target process. An attacker can provide a malicious file to trigger this vulnerability.

How urgent is CVE-2022-43665?

Priority 31/100. Public exploit reference

Related CVEs

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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