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NVD / CVE Program· CNA mitre

CVE-2021-45671: Certain NETGEAR devices are affected by stored XSS.

Noroxi assessment

Priority: Monitor (action score 19/100)

  • 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: 0.43% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. A user must open a link or visit a page. 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

Certain NETGEAR devices are affected by stored XSS. This affects CBR40 before 2.5.0.10, EAX80 before 1.0.1.62, EX7500 before 1.0.0.72, R7900 before 1.0.4.38, R8000 before 1.0.4.68, RAX200 before 1.0.4.120, RBS40V before 2.6.1.4, RBW30 before 2.6.1.4, MR60 before 1.0.6.110, RAX20 before 1.0.2.82, RAX45 before 1.0.2.72, RAX80 before 1.0.4.120, MS60 before 1.0.6.110, RAX15 before 1.0.2.82, RAX50 before 1.0.2.72, RAX75 before 1.0.4.120, RBR750 before 3.2.16.6, RBR850 before 3.2.16.6, RBS750 before 3.2.16.6, RBS850 before 3.2.16.6, RBK752 before 3.2.16.6, and RBK852 before 3.2.16.6.

MediumCVSS 4.8 · v3.1—No exploit No fix recorded
Published
Dec 25, 2021
Updated
Jun 17, 2026
EPSS
0.4% · 37th percentile

Report tools

JSON

Action score

19

Monitor

Low priority for now.

CVSS
19 / 40 · 4.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CNA vs NVD score

NVD
4.8
CNA · mitre
6.5
1.7 point gap

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

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-2021-45671

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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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
netgearrax200 firmware
netgearrax200
netgearmr60 firmware
netgearmr60
netgearrax20 firmware
netgearrax20
netgearrax45 firmware
netgearrax45
netgearrax80 firmware
netgearrax80
netgearms60 firmware
netgearms60

and 32 more

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Affected versions

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

  • netgear cbr40 firmwarebefore 2.5.0.10
  • netgear eax80 firmwarebefore 1.0.1.62
  • netgear ex7500 firmwarebefore 1.0.0.72
  • netgear mr60 firmwarebefore 1.0.6.110
  • netgear ms60 firmwarebefore 1.0.6.110
  • netgear r7900 firmwarebefore 1.0.4.38
  • netgear r8000 firmwarebefore 1.0.4.68
  • netgear rax15 firmwarebefore 1.0.2.82
  • netgear rax20 firmwarebefore 1.0.2.82
  • netgear rax200 firmwarebefore 1.0.4.120
  • netgear rax45 firmwarebefore 1.0.2.72
  • netgear rax50 firmwarebefore 1.0.2.72
  • netgear rax75 firmwarebefore 1.0.4.120
  • netgear rax80 firmwarebefore 1.0.4.120
  • netgear rbk752 firmwarebefore 3.2.16.6
  • netgear rbk852 firmwarebefore 3.2.16.6
  • netgear rbr750 firmwarebefore 3.2.16.6
  • netgear rbr850 firmwarebefore 3.2.16.6
  • netgear rbs40v firmwarebefore 2.6.1.4
  • netgear rbs750 firmwarebefore 3.2.16.6

Same product

netgear: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-45678NETGEAR RAX200 devices before 1.0.5.132 are affected by insecure code.
    39Monitor
  • CVE-2021-45541Certain NETGEAR devices are affected by command injection by an authenticated user.
    35Monitor
  • CVE-2021-38518Certain NETGEAR devices are affected by command injection by an authenticated user.
    28Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-45669Dec 25, 2021 · Certain NETGEAR devices are affected by stored XSS.
    19Monitor
  • ← EarlierCVE-2021-45670Dec 25, 2021 · Certain NETGEAR devices are affected by stored XSS.
    19Monitor
  • Later →CVE-2021-45676Dec 25, 2021 · Certain NETGEAR devices are affected by stored XSS.
    19Monitor

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.

No history yet (it accumulates with the daily EPSS job).

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.

No credits in the CNA record.

Variant candidates

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

No nightly-computed relations.

Chain candidates

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

—

Bug bounty scope

No known public program.

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

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

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

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

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

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

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

ATT&CK techniques

—

Change log

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

References

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

All records