CVE-2021-21495Public exploitNetwork attack vector

Password overwrite via forged cross-site request

Published Jan 4, 2021 · Updated Aug 3, 2024

Cross-site request forgery in MK-AUTH 19.01 K4.9 and earlier allows remote attackers to overwrite a user's password through a crafted webpage. The password-change endpoint processes a cross-site POST containing attacker-chosen senha and senha2 values without validating the request's origin. An authenticated Central user must visit the malicious page, after which the attacker controls the replacement credential.

CVSS severity8.8
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in MK-AUTH 19.01 K4.9 and earlier allows remote attackers to overwrite a user's password through a crafted webpage. The password-change endpoint processes a cross-site POST containing attacker-chosen senha and senha2 values without validating the request's origin. An authenticated Central user must visit the malicious page, after which the attacker controls the replacement credential.

The record

CVE
CVE-2021-21495
Published
Jan 4, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 4, 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

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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-352Cross-Site Request Forgery (CSRF)
T1098Account Manipulation

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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