HOMEVULNERABILITIESCVE-2021-34983
MEDIUM

CVE-2021-34983

CWE-306Published: May 7, 2024· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

NETGEAR Multiple Routers httpd Missing Authentication for Critical Function Information Disclosure Vulnerability. This vulnerability allows network-adjacent attackers to disclose sensitive information 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. The issue results from the lack of authentication prior to allowing access to system configuration information. An attacker can leverage this vulnerability to disclose stored credentials, leading to further compromise. Was ZDI-CAN-13708.

NVD Source

Technical Analysis

CVE-2021-34983 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), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

netgear104 product(s)
xr1000 firmwarexr1000xr300 firmwarexr300d6220 firmwared6220d6400 firmwared6400d7000v2 firmwared7000v2dgn2200v4 firmwaredgn2200v4+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-21-1275/
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-21-1275/

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-21-1275/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-21-1275/Third Party Advisory

Quick Facts

CVE IDCVE-2021-34983
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-306
CISA KEVNo
Affected1 vendor(s)
PublishedMay 7, 2024

Related CVEs (CWE-306)

CVE-2020-26822
10.0
CVE-2020-26824
10.0
CVE-2014-9197
10.0
CVE-2020-26821
10.0
CVE-2020-26823
10.0
CVE-2020-26829
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-34983 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.
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