CVE-2019-5135Public exploitNetwork attack vector

Credential-hash disclosure via crypt timing discrepancy

Published Mar 10, 2020 · Updated Aug 4, 2024

Timing information disclosure in WAGO PFC100/200 firmware allows remote attackers to recover WBM password hashes over the network. The PasswordCorrect() function in login.php passes an HTTP POST password to PHP crypt() with the stored algorithm and salt, while input-dependent response delays reveal the salt and hash. Affected builds are PFC100 03.00.39(12) and PFC200 03.00.39(12) and 03.01.07(13); cracking a recovered hash grants WBM access, or system access when WBM uses /etc/shadow.

CVSS severity5.3
Medium
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timing information disclosure in WAGO PFC100/200 firmware allows remote attackers to recover WBM password hashes over the network. The PasswordCorrect() function in login.php passes an HTTP POST password to PHP crypt() with the stored algorithm and salt, while input-dependent response delays reveal the salt and hash. Affected builds are PFC100 03.00.39(12) and PFC200 03.00.39(12) and 03.01.07(13); cracking a recovered hash grants WBM access, or system access when WBM uses /etc/shadow.

The record

CVE
CVE-2019-5135
Published
Mar 10, 2020
Updated
Aug 4, 2024
Vendor
WAGO
Product
WAGO PFC100 Firmware
Classifications
CWE-327, CWE-208, T1212
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

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

  1. Affected versionversion=version 03.00.39(12)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WAGO · WAGO PFC100 Firmwareversion=version 03.00.39(12)
WAGO · WAGO PFC200 Firmwareversion=version 03.00.39(12); version=version 03.01.07(13)

Published CVSS scores

5.3Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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-327Use of a Broken or Risky Cryptographic Algorithm
CWE-208Observable Timing Discrepancy
T1212Exploitation for Credential Access

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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