Is CVE-2023-35721 in the CISA KEV catalog?

No. CVE-2023-35721 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-35721?

CVE-2023-35721 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2023-35721?

CVE-2023-35721 has an EPSS score of 0.97% (58th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-35721?

Upgrade rax50 firmware to 1.0.15.128 or later.

CVE & CISA-KEV Catalog

CVE-2023-35721

HIGH

8.8

CVSS v3

NVD

Description

NETGEAR Multiple Routers curl_post Improper Certificate Validation Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of multiple NETGEAR routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the update functionality, which operates over HTTPS. The issue results from the lack of proper validation of the certificate presented by the server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-19981.

CWE-295Improper Certificate Validation

How to fix

Remediation Available

rax50 firmwareNVD

Affected:< 1.0.15.128Fixed in:1.0.15.128CVE-2023-35721derived 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 VectorAdjacent

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.97%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Vendor Advisory1

kb.netgear.com

Third-Party Advisory1

zerodayinitiative.com

Related Vulnerabilities

Other CWE-295 (Improper Certificate Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2020-0601	High	8.1	89%	KEV	Fix
CVE-2009-3555	Critical	9.8	87%	-	Fix
CVE-2022-26923	High	8.8	83%	KEV	Fix
CVE-2023-27823	Critical	9.8	53%	-	-
CVE-2022-42979	High	8.8	24%	-	-

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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 2025-08-07.