How severe is CVE-2022-43931?

CVE-2022-43931 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-43931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-43931?

CVE-2022-43931 affects Synology Vpn Plus Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-43931?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-43931 published?

CVE-2022-43931 was published on 2023-01-03 and last updated on 2026-06-17.

CVE-2022-43931

CVE-2022-43931 is a critical-severity vulnerability in Synology Vpn Plus Server with a CVSS 3.x base score of 10.0. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Synology Vpn Plus Server
Published: 2023-01-03
Last modified: 2026-06-17

Description

Out-of-bounds write vulnerability in Remote Desktop Functionality in Synology VPN Plus Server before 1.4.3-0534 and 1.4.4-0635 allows remote attackers to execute arbitrary commands via unspecified vectors.

Frequently asked questions

What is CVE-2022-43931?: Out-of-bounds write vulnerability in Remote Desktop Functionality in Synology VPN Plus Server before 1.4.3-0534 and 1.4.4-0635 allows remote attackers to execute arbitrary commands via unspecified vectors.
How severe is CVE-2022-43931?: CVE-2022-43931 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-43931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-43931?: CVE-2022-43931 affects Synology Vpn Plus Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-43931?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-43931 published?: CVE-2022-43931 was published on 2023-01-03 and last updated on 2026-06-17.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_22_26

Affected products (1)

cpe:2.3:a:synology:vpn_plus_server:*:*:*:*:*:*:*:*