HOMEVULNERABILITIESCVE-2021-34982
HIGH

CVE-2021-34982

CWE-121Published: May 7, 2024· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

NETGEAR Multiple Routers httpd Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of multiple NETGEAR routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the httpd service, which listens on TCP port 80 by default. When parsing the strings file, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root.

. Was ZDI-CAN-13709.

NVD Source

Technical Analysis

CVE-2021-34982 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

netgear104 product(s)
dc112a firmwaredc112aex3700 firmwareex3700ex3800 firmwareex3800ex6120 firmwareex6120ex6130 firmwareex6130ex7000 firmwareex7000+92
Source: NVD CPE · 104 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://kb.netgear.com/000064313/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Extenders-Routers-and-DSL-Modem-Routers-PSV-2021-0159
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1274/
ADVISORYhttps://kb.netgear.com/000064313/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Extenders-Routers-and-DSL-Modem-Routers-PSV-2021-0159
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1274/

All References (4)

→
https://kb.netgear.com/000064313/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Extenders-Routers-and-DSL-Modem-Routers-PSV-2021-0159Vendor Advisory
→
https://www.zerodayinitiative.com/advisories/ZDI-21-1274/Third Party Advisory
→
https://kb.netgear.com/000064313/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Extenders-Routers-and-DSL-Modem-Routers-PSV-2021-0159Vendor Advisory
→
https://www.zerodayinitiative.com/advisories/ZDI-21-1274/Third Party Advisory

Quick Facts

CVE IDCVE-2021-34982
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-121
CISA KEVNo
Affected1 vendor(s)
PublishedMay 7, 2024

Related CVEs (CWE-121)

CVE-2014-9190
10.0
CVE-2017-20230
10.0
CVE-2026-12847
10.0
CVE-2026-12848
10.0
CVE-2026-37541
10.0
CVE-2026-12485
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-34982 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-34982·NVD