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NVD / CVE Program· CNA zdi

CVE-2021-34865: This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of multiple NETGEAR routers.

Noroxi assessment

Priority: Monitor (action score 36/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3% (FIRST EPSS); higher than 87.5% of all records.
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of multiple NETGEAR routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-13313.

HighCVSS 8.8 · v3.1—No exploit No fix recorded
Published
Jan 25, 2022
Updated
Jun 16, 2026
EPSS
3.0% · 87th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.0%

CNA vs NVD score

NVD
8.8
CNA · zdi
8.8
agree

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-34865

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
netgearac2100 firmware
netgearac2100
netgearac2400 firmware
netgearac2400
netgearac2600 firmware
netgearac2600
netgeard7000v1 firmware
netgeard7000v1
netgearr6220 firmware
netgearr6220
netgearr6230 firmware
netgearr6230

and 22 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • netgear ac2100 firmwarebefore 1.2.0.88
  • netgear ac2400 firmwarebefore 1.2.0.88
  • netgear ac2600 firmwarebefore 1.2.0.88
  • netgear d7000v1 firmwarebefore 1.0.1.80
  • netgear r6220 firmwarebefore 1.1.0.110
  • netgear r6230 firmwarebefore 1.1.0.110
  • netgear r6260 firmwarebefore 1.1.0.84
  • netgear r6330 firmwarebefore 1.1.0.84
  • netgear r6350 firmwarebefore 1.1.0.84
  • netgear r6700v2 firmwarebefore 1.2.0.88
  • netgear r6800 firmwarebefore 1.2.0.88
  • netgear r6850 firmwarebefore 1.1.0.84
  • netgear r6900v2 firmwarebefore 1.2.0.88
  • netgear r7200 firmwarebefore 1.2.0.88
  • netgear r7350 firmwarebefore 1.2.0.88
  • netgear r7400 firmwarebefore 1.2.0.88
  • netgear r7450 firmwarebefore 1.2.0.88

Versions reported by the vendor

Affected version ranges reported by the assigning authority (zdi). Independent of NVD's CPE analysis and usually ahead of it.

  • NETGEAR Multiple Routers

    • 1.2.0.76_1.0.1affected

Same product

netgear: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-45511Certain NETGEAR devices are affected by authentication bypass.
    60This week
  • CVE-2021-45644Certain NETGEAR devices are affected by incorrect configuration of security settings.
    39Monitor
  • CVE-2020-35795Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker.
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-27866Feb 11, 2021 · This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R6020, R6080, R6120, R622
    38Monitor
  • ← EarlierCVE-2020-27867Feb 11, 2021 · This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6020, R6080, R6120, R62
    28Monitor
  • ← EarlierCVE-2021-45534Dec 25, 2021 · Certain NETGEAR devices are affected by command injection by an authenticated user.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2021-4553431 days apartCertain NETGEAR devices are affected by command injection by an authenticated user.
    31Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records