CVE-2019-17525Public exploitNetwork attack vector

Credential brute forcing via reusable CAPTCHA request

Published Apr 21, 2020 · Updated Aug 5, 2024

CAPTCHA bypass in the D-Link DIR-615 T1 20.10 login page allows remote attackers to brute-force administrative credentials. The login handler accepts repeated username and password guesses when a request containing one correctly solved CAPTCHA is intercepted and replayed. Network access to the router's web login interface is sufficient; the flaw enables repeated guessing but does not itself disclose a password.

CVSS severity8.8
High
EPSS probability5.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CAPTCHA bypass in the D-Link DIR-615 T1 20.10 login page allows remote attackers to brute-force administrative credentials. The login handler accepts repeated username and password guesses when a request containing one correctly solved CAPTCHA is intercepted and replayed. Network access to the router's web login interface is sufficient; the flaw enables repeated guessing but does not itself disclose a password.

The record

CVE
CVE-2019-17525
Published
Apr 21, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, CAPEC-49, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

4.0NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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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-307Improper Restriction of Excessive Authentication Attempts
CAPEC-49Password Brute Forcing
T1110.001Password Guessing

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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