Is CVE-2022-26531 in the CISA KEV catalog?

No. CVE-2022-26531 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-26531?

CVE-2022-26531 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2022-26531?

CVE-2022-26531 has an EPSS score of 5.80% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-26531?

Upgrade nsg100 firmware to 1.33 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2022-26531

MEDIUMEPSS 92th pctl

6.1

CVSS v3

NVD

Description

Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, VPN series firmware versions 4.30 through 5.21, NSG series firmware versions 1.00 through 1.33 Patch 4, NXC2500 firmware version 6.10(AAIG.3) and earlier versions, NAP203 firmware version 6.25(ABFA.7) and earlier versions, NWA50AX firmware version 6.25(ABYW.5) and earlier versions, WAC500 firmware version 6.30(ABVS.2) and earlier versions, and WAX510D firmware version 6.30(ABTF.2) and earlier versions, that could allow a local authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.

CWE-20Improper Input Validation

How to fix

Remediation Available

nsg100 firmwareNVD

Affected:>= 1.00, < 1.33Fixed in:1.33CVE-2022-26531derived from NVD

nsg300 firmwareNVD

Affected:>= 1.00, < 1.33Fixed in:1.33CVE-2022-26531derived from NVD

nsg50 firmwareNVD

Affected:>= 1.00, < 1.33Fixed in:1.33CVE-2022-26531derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Exploit Intelligence

5.80%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Vendor Advisory1

zyxel.com

Other references3

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.