Is CVE-2021-27239 actively exploited?

CVE-2021-27239 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-27239?

CVE-2021-27239 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-27239?

Patch guidance is available from netgear security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-27239.

Fix CVE-2021-27239 - HIGH netgear d6220 firmware

Q: Which products are affected by CVE-2021-27239?

36 products: netgear d6220 firmware, netgear d6400 firmware, netgear d7000 firmware, netgear d8500 firmware, netgear dc112a firmware, and 31 more.

Description

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 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.

CVSS Metrics

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: adjacent network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-121

Metadata

Primary Vendor: NETGEAR
Published: 3/29/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

netgear : d6220_firmwarenetgear : d6400_firmwarenetgear : d7000_firmwarenetgear : d8500_firmwarenetgear : dc112a_firmwarenetgear : ex7000_firmwarenetgear : ex7500_firmwarenetgear : r6250_firmwarenetgear : r6300_firmwarenetgear : r6400_firmwarenetgear : r6400_firmwarenetgear : r6700_firmwarenetgear : r6900p_firmwarenetgear : r7000_firmwarenetgear : r7000p_firmwarenetgear : r7100lg_firmwarenetgear : r7850_firmwarenetgear : r7900_firmwarenetgear : r7900p_firmwarenetgear : r7960p_firmwarenetgear : r8000_firmwarenetgear : r8000p_firmwarenetgear : r8300_firmwarenetgear : r8500_firmwarenetgear : rax200_firmwarenetgear : rax75_firmwarenetgear : rax80_firmwarenetgear : rbr750_firmwarenetgear : rbr850_firmwarenetgear : rbs40v_firmwarenetgear : rbs750_firmwarenetgear : rbs850_firmwarenetgear : rs400_firmwarenetgear : wndr3400_firmwarenetgear : wnr3500l_firmwarenetgear : xr300_firmware

Remediation Guidance

Executive Summary

View on NIST NVD