Is CVE-2022-43391 in the CISA KEV catalog?

No. CVE-2022-43391 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-43391?

CVE-2022-43391 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2022-43391?

CVE-2022-43391 has an EPSS score of 0.72% (50th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-43391?

Upgrade ex3510-b0 firmware to 5.17(abup.7)c0 or later. Fixes are available for 11 affected products.

CVE & CISA-KEV Catalog

CVE-2022-43391

MEDIUM

6.5

CVSS v3

NVD

Description

A buffer overflow vulnerability in the parameter of the CGI program in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated attacker to cause denial-of-service (DoS) conditions by sending a crafted HTTP request.

CWE-120Classic Buffer Overflow

How to fix

Remediation Available

ex3510-b0 firmwareNVD

Affected:< 5.17(abup.7)c0Fixed in:5.17(abup.7)c0CVE-2022-43391derived from NVD

ex5510-b0 firmwareNVD

Affected:< 5.17(abqx.7)c0Fixed in:5.17(abqx.7)c0CVE-2022-43391derived from NVD

lte7480-m804 firmwareNVD

Affected:< 1.00(abra.6)c0Fixed in:1.00(abra.6)c0CVE-2022-43391derived from NVD

lte7490-m904 firmwareNVD

Affected:< 1.00(abqy.5)c0Fixed in:1.00(abqy.5)c0CVE-2022-43391derived from NVD

nebula lte3301-plus firmwareNVD

Affected:< 1.15(acca.3)c0Fixed in:1.15(acca.3)c0CVE-2022-43391derived from NVD

nebula lte7461-m602 firmwareNVD

Affected:< 1.15(acev.3)c0Fixed in:1.15(acev.3)c0CVE-2022-43391derived from NVD

nebula nr5101 firmwareNVD

Affected:< 1.15(accg.3)c0Fixed in:1.15(accg.3)c0CVE-2022-43391derived from NVD

nebula nr7101 firmwareNVD

Affected:< 1.15(accc.3)c0Fixed in:1.15(accc.3)c0CVE-2022-43391derived from NVD

nr5101 firmwareNVD

Affected:< 1.00(abvc.6)c0Fixed in:1.00(abvc.6)c0CVE-2022-43391derived from NVD

nr7101 firmwareNVD

Affected:< 1.00(abuv.7)c0Fixed in:1.00(abuv.7)c0CVE-2022-43391derived from NVD

nr7102 firmwareNVD

Affected:< 1.00(abyd.2)c0Fixed in:1.00(abyd.2)c0CVE-2022-43391derived 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 VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.72%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Vendor Advisory1

zyxel.com

Related Vulnerabilities

Other CWE-120 (Classic Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0195	Medium	6.8	100%	-	Fix
CVE-2017-7269	Critical	9.8	100%	KEV	-
CVE-2019-11043	High	8.7	99%	KEV + Ransom	Fix
CVE-2011-4862	High	10.0	95%	-	Fix
CVE-2007-5659	High	7.8	94%	KEV	Fix
CVE-2022-3786	High	7.5	91%	-	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 2026-02-25.