Vulnerability Details : CVE-2021-27239

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.
Published 2021-03-29 21:15:12
Updated 2021-04-02 14:03:08
Source Zero Day Initiative
View at NVD,   CVE.org
Vulnerability category: Execute code

Products affected by CVE-2021-27239

Exploit prediction scoring system (EPSS) score for CVE-2021-27239

EPSS FAQ
0.20%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 57 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-27239

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
8.3
 HIGH AV:A/AC:L/Au:N/C:C/I:C/A:C
6.5
10.0
 NIST
8.8
 HIGH CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
 Zero Day Initiative
8.8
 HIGH CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
 NIST

CWE ids for CVE-2021-27239

  • A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
    Assigned by: zdi-disclosures@trendmicro.com (Primary)

References for CVE-2021-27239

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