CVE-2021-20092Public exploitNetwork attack vector

Unauthenticated administrator password disclosure via exposed httoken

Published Apr 29, 2021 · Updated Aug 3, 2024

Improper access control in Buffalo WSR-2533DHPL2 1.02 and earlier and WSR-2533DHP3 1.24 and earlier allows remote attackers to read admin passwords. The loginerror.html page exposes a valid httoken, and cgi/cgi_i_filter.js accepts that token and its Referer to return login_password in JavaScript configuration data. Network access to the router web interface is sufficient; the demonstrated request discloses the administrator password without altering configuration or interrupting service.

CVSS severity5.9
Medium
EPSS probability8.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Buffalo WSR-2533DHPL2 1.02 and earlier and WSR-2533DHP3 1.24 and earlier allows remote attackers to read admin passwords. The loginerror.html page exposes a valid httoken, and cgi/cgi_i_filter.js accepts that token and its Referer to return login_password in JavaScript configuration data. Network access to the router web interface is sufficient; the demonstrated request discloses the administrator password without altering configuration or interrupting service.

The record

CVE
CVE-2021-20092
Published
Apr 29, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1552
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9TenableCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1552Unsecured Credentials

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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