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Vulnerability record · CVE-2021-27254 · published 5 March 2021

CVE-2021-27254: Netgear br200 firmware hard-coded password vulnerability

Netgear · Br200 Firmware

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.

8.8 CVSS 3.1 High EPSS 0.52% · top 58.1% CWE-259 · Hard-coded passwordCWE-798 · Hard-coded credentials
8.8CVSS 3.1 base score, v2 8.3
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
43Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.

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

Affected products

43 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders PatchVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-252/ Third Party AdvisoryVDB Entry
https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders PatchVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-252/ Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2016-10174NETGEAR router buffer overflow in hidden_lang_avi parameterThe NETGEAR WNR2000v5 router contains a buffer overflow in the hidden_lang_avi parameter when invoking the URL /apply.cgi?/lang_check.html. An unauth…KEVEPSS 83%analysed9.8CVE-2021-45658Netgear d7800 firmware injection vulnerabilityCertain NETGEAR devices are affected by server-side injection. This affects D7800 before 1.0.1.58, DM200 before 1.0.0.66, EX2700 before 1.0.1.56, EX6…EPSS 0.82%9.8CVE-2021-45619Netgear ex6250 firmware command injection vulnerabilityCertain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects EX6200v2 before 1.0.1.86, EX6250 before 1.0.0.…EPSS 2.5%9.8CVE-2021-45608Netgear d7800 firmware integer overflow vulnerabilityCertain D-Link, Edimax, NETGEAR, TP-Link, Tenda, and Western Digital devices are affected by an integer overflow by an unauthenticated attacker. Remo…EPSS 2.5%9.8CVE-2021-45618Netgear d7800 firmware command injection vulnerabilityCertain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D7800 before 1.0.1.64, EX6200v2 before 1.0.1.8…EPSS 2.0%9.8CVE-2021-38529Netgear d7800 firmware command injection vulnerabilityCertain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D7800 before 1.0.1.56, R7800 before 1.0.2.68, …EPSS 1.7%9.8CVE-2021-38516Netgear d6220 firmware vulnerabilityCertain NETGEAR devices are affected by lack of access control at the function level. This affects D6220 before 1.0.0.48, D6400 before 1.0.0.82, D700…EPSS 1.3%9.8CVE-2020-35795Netgear ac2100 firmware classic buffer overflow vulnerabilityCertain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects AC2100 before 1.2.0.72, AC2400 before 1.2.0.72…EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2021-27254), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.