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CVE-2021-34982

NETGEAR Multiple Routers httpd Stack-based Buffer Overflow Remote Code Execution Vulnerability

HIGH
8.8
CVSS Score
Published: May 7, 2024 at 10:54 PM UTC
Updated: June 17, 2026 at 03:56 AM UTC
104 products affected across 1 vendorR7000P FirmwareR7000 FirmwareR8500 Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

D6220 Firmware· NETGEAR
95%
v < 1.0.0.76
Affected range stops below 1.0.0.76, so it looks safe — our inference, not a vendor statement
netgear-d6220 (same device)
D6400 Firmware· NETGEAR
95%
v < 1.0.0.108
Affected range stops below 1.0.0.108, so it looks safe — our inference, not a vendor statement
netgear-d6400 (same device)
D7000V2 Firmware· NETGEAR
95%
v < 1.0.0.76
Affected range stops below 1.0.0.76, so it looks safe — our inference, not a vendor statement
netgear-d7000v2 (same device)
DC112A Firmware· NETGEAR
95%
v < 1.0.0.62
Affected range stops below 1.0.0.62, so it looks safe — our inference, not a vendor statement
DGN2200V4 Firmware· NETGEAR
95%
v < 1.0.0.126
Affected range stops below 1.0.0.126, so it looks safe — our inference, not a vendor statement
netgear-dgn2200v4 (same device)
EX3700 Firmware· NETGEAR
95%
v < 1.0.0.94
Affected range stops below 1.0.0.94, so it looks safe — our inference, not a vendor statement
EX3800 Firmware· NETGEAR
95%
v < 1.0.0.94
Affected range stops below 1.0.0.94, so it looks safe — our inference, not a vendor statement
netgear-ex3800 (same device)
EX6120 Firmware· NETGEAR
95%
v < 1.0.0.66
Affected range stops below 1.0.0.66, so it looks safe — our inference, not a vendor statement
EX6130 Firmware· NETGEAR
95%
v < 1.0.0.46
Affected range stops below 1.0.0.46, so it looks safe — our inference, not a vendor statement
netgear-ex6130 (same device)
EX7000 Firmware· NETGEAR
95%
v < 1.0.1.106
Affected range stops below 1.0.1.106, so it looks safe — our inference, not a vendor statement
netgear-ex7000 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: [email protected]
https://kb.netgear.com/000064313/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Extenders-Routers-and-DSL-Modem-Routers-PSV-2021-0159
x_research-advisoryThird Party Advisory
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-21-1274/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHzdi
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121CWE-787

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