Skip to content
Noroxi
CVE-2021-41435· NVD / CVE Program· CNA mitre

A brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-AX56U_V2, RT-AX58U, R

A brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-AX56U_V2, RT-AX58U, RT-AX82U, RT-AX82U GUNDAM EDITION, RT-AX86 Series(RT-AX86U/RT-AX86S), RT-AX86U ZAKU II EDITION, RT-AX88U, RT-AX92U, TUF Gaming AX3000, TUF Gaming AX5400 (TUF-AX5400), ASUS ZenWiFi XD6, ASUS ZenWiFi AX (XT8) before 3.0.0.4.386.45898, and RT-AX68U before 3.0.0.4.386.45911, allows a remote attacker to attempt any number of login attempts via sending a specific HTTP request.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded
Published
Nov 19, 2021
Updated
Jul 9, 2026
EPSS
6.5% · 94th percentile
Follow this CVE

Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.

Report tools

JSON

Action score

41

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 6.5%

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Affected systems

VendorProduct
asusgt-ax11000 firmware
asusgt-ax11000
asusrt-ax3000 firmware
asusrt-ax3000
asusrt-ax55 firmware
asusrt-ax55
asusrt-ax56u firmware
asusrt-ax56u
asusrt-ax56u v2 firmware
asusrt-ax56u v2
asusrt-ax58u firmware
asusrt-ax58u

and 24 more

Affected versions

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

  • asus gt-ax11000 firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax3000 firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax55 firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax56u firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax56u v2 firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax58u firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax68u firmwarebefore 3.0.0.4.386.45911
  • asus rt-ax82u firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax82u gundam edition firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax86s firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax86u firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax86u zaku ii edition firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax88u firmwarebefore 3.0.0.4.386.45898
  • asus rt-ax92u firmwarebefore 3.0.0.4.386.45898
  • asus tuf gaming ax3000 firmwarebefore 3.0.0.4.386.45898
  • asus tuf-ax5400 firmwarebefore 3.0.0.4.386.45898
  • asus zenwifi ax (xt8) firmwarebefore 3.0.0.4.386.45898
  • asus zenwifi xd6 firmwarebefore 3.0.0.4.386.45898

Same product

asus: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-41436An HTTP request smuggling in web application in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-AX56U_V2, RT-AX58U, RT-AX82U,
    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+1% in 7 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.

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.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-307 · Improper Restriction of Excessive Authentication Attempts

CVSS vector

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

nvd-primary

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

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

All records