Vulnerability · Published Mar 5, 2021 · Assigned by zdi

CVE-2021-27257

Medium 6.5

In plain English

A medium-severity improper certificate validation in R7800 from NETGEAR. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 3.0)6.5Medium

Exploit odds (30 days)0.3%top 74.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloading of files via FTP. 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-12362.

Affected products (as reported)

Vendor	Product	Versions
NETGEAR	R7800	firmware version 1.0.2.76

Weakness: CWE-295 · Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders x_refsource_MISC
https://www.zerodayinitiative.com/advisories/ZDI-21-264/ x_refsource_MISC