CVE-2025-32036Network attack vector

CAPTCHA bypass via low-complexity image generation

Published Apr 8, 2025 · Updated Apr 8, 2025

Guessable CAPTCHA generation in DNN Software DNN Platform before 9.13.8 allows remote attackers to automate protected requests. CaptchaControl.cs renders the full challenge text with limited distortion and without noise, per-character font variation, jitter, or random lines, leaving characters OCR-readable. Exploitation requires a CAPTCHA-enabled workflow and user interaction; successful recognition enables automated requests that the CAPTCHA was intended to block.

CVSS severity4.2
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Guessable CAPTCHA generation in DNN Software DNN Platform before 9.13.8 allows remote attackers to automate protected requests. CaptchaControl.cs renders the full challenge text with limited distortion and without noise, per-character font variation, jitter, or random lines, leaving characters OCR-readable. Exploitation requires a CAPTCHA-enabled workflow and user interaction; successful recognition enables automated requests that the CAPTCHA was intended to block.

The record

CVE
CVE-2025-32036
Published
Apr 8, 2025
Updated
Apr 8, 2025
Vendor
DNN Software
Product
DNN Platform
Classifications
CWE-804
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 9.13.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DNN Software · DNN Platformversion=< 9.13.8

Published CVSS scores

4.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-804Guessable CAPTCHA

Public exploit references

No public exploit references are available in this record.

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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