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CVE-2019-5135· NVD / CVE Program· CNA talos

An exploitable timing discrepancy vulnerability exists in the authentication functionality of the Web-Based Management (WBM) web application

An exploitable timing discrepancy vulnerability exists in the authentication functionality of the Web-Based Management (WBM) web application on WAGO PFC100/200 controllers. The WBM application makes use of the PHP crypt() function which can be exploited to disclose hashed user credentials. This affects WAGO PFC200 Firmware version 03.00.39(12) and version 03.01.07(13), and WAGO PFC100 Firmware version 03.00.39(12).

MediumCVSS 5.3 · v3.1—No exploit No fix recorded

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Published
Mar 11, 2020
Updated
Jun 16, 2026
EPSS
1.0% · 63th percentile
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Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

Affected systems

VendorProduct
wagopfc200 firmware
wagopfc200
wagopfc100 firmware
wagopfc100

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • wago pfc100 firmware03.00.39(12)
  • wago pfc200 firmware03.00.39(12)
  • wago pfc200 firmware03.01.07(13)

Versions reported by the vendor

Affected version ranges reported by the assigning authority (talos). Independent of NVD's CPE analysis and usually ahead of it.

  • Wago WAGO PFC100 Firmware

    • version 03.00.39(12)affected

  • Wago WAGO PFC200 Firmware

    • version 03.00.39(12), version 03.01.07(13)affected

Same product

wago: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-5082An exploitable heap buffer overflow vulnerability exists in the iocheckd service I/O-Check functionality of WAGO PFC200 Firmware version 03.
    40Plan
  • CVE-2018-5459An Improper Authentication issue was discovered in WAGO PFC200 Series 3S CoDeSys Runtime versions 2.3.X and 2.4.X.
    40Plan
  • CVE-2019-5161An exploitable remote code execution vulnerability exists in the Cloud Connectivity functionality of WAGO PFC200 versions 03.02.02(14), 03.0
    37Monitor
  • CVE-2019-5160An exploitable improper host validation vulnerability exists in the Cloud Connectivity functionality of WAGO PFC200 Firmware versions 03.02.
    37Monitor
  • CVE-2016-9362An issue was discovered in WAGO 750-8202/PFC200 prior to FW04 (released August 2015), WAGO 750-881 prior to FW09 (released August 2016), and
    37Monitor
  • CVE-2019-5184An exploitable double free vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC 200.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

All records