Cyber Resilience

CVE-2021-27239

High

Published: 29 March 2021

Published
29 March 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0259 85.9th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-27239 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Netgear R6400 Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 14.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400 and R6700 firmware version 1.0.4.98 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the upnpd service, which listens on…

more

UDP port 1900 by default. A crafted MX header field in an SSDP message can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11851.

CWE(s)
CWE-121

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

netgear
d6220 firmware
≤ 1.0.0.68
netgear
d6400 firmware
≤ 1.0.0.102
netgear
d7000 firmware
≤ 1.0.0.66
netgear
d8500 firmware
≤ 1.0.3.60
netgear
dc112a firmware
≤ 1.0.0.54
netgear
ex7000 firmware
≤ 1.0.1.94
netgear
ex7500 firmware
≤ 1.0.0.72
netgear
r6250 firmware
≤ 1.0.4.48
netgear
r6300 firmware
≤ 1.0.4.50
netgear
r6400 firmware
≤ 1.0.1.68 · ≤ 1.0.4.102
+25 more product configuration(s) — see NVD for full list

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References