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NVD / CVE Program· CNA CERTVDE

CVE-2021-34569: WAGO I/O-Check Service prone to Out-of-bounds Write

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.87% (FIRST EPSS); higher than 58.9% of all records.
  • 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.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In WAGO I/O-Check Service in multiple products an attacker can send a specially crafted packet containing OS commands to crash the diagnostic tool and write memory.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded
Published
Nov 9, 2022
Updated
Jun 16, 2026
EPSS
0.8% · 58th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · CERTVDE
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-34569

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
wago750-8100 firmware
wago750-8100
wago750-8101 firmware
wago750-8101
wago750-8101\/025-000 firmware
wago750-8101\/025-000
wago750-8102 firmware
wago750-8102
wago750-8102\/025-000 firmware
wago750-8102\/025-000
wago750-8202 firmware
wago750-8202

and 86 more

Affected versions

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

  • wago 750-8100 firmwarebefore 18
  • wago 750-8100 firmware18
  • wago 750-8101 firmwarebefore 18
  • wago 750-8101 firmware18
  • wago 750-8101/025-000 firmwarebefore 18
  • wago 750-8101/025-000 firmware18
  • wago 750-8102 firmwarebefore 18
  • wago 750-8102 firmware18
  • wago 750-8102/025-000 firmwarebefore 18
  • wago 750-8102/025-000 firmware18
  • wago 750-8202 firmwarebefore 18
  • wago 750-8202 firmware18
  • wago 750-8202/000-011 firmwarebefore 18
  • wago 750-8202/000-011 firmware18
  • wago 750-8202/000-012 firmwarebefore 18
  • wago 750-8202/000-012 firmware18
  • wago 750-8202/000-022 firmwarebefore 18
  • wago 750-8202/000-022 firmware18
  • wago 750-8202/025-000 firmwarebefore 18
  • wago 750-8202/025-000 firmware18

Versions reported by the vendor

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

  • WAGO 750-81xx/xxx-xxxFW

    • FW1 and later · up to and including FW18 Patch 2affected

  • WAGO 750-82xx/xxx-xxx

    • FW1 and later · up to and including FW18 Patch 2affected

  • WAGO 752-8303/8000-0002

    • FW1 and later · up to and including FW18 Patch 2affected

  • WAGO 762-4xxx

    • FW1 and later · up to and including FW18 Patch 2affected

  • WAGO 762-5xxx

    • FW1 and later · up to and including FW18 Patch 2affected

  • WAGO 762-6xxx

    • FW1 and later · up to and including FW18 Patch 2affected

Same product

wago: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-34566WAGO I/O-Check Service prone to Memory Overflow
    36Monitor
  • CVE-2021-34567WAGO I/O-Check Service prone to Out-of-bounds Read
    32Monitor
  • CVE-2021-34568WAGO I/O-Check Service prone to Allocation of Resources Without Limits or Throttling
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2022-22511Mar 9, 2022 · WAGO PLCs WBM vulnerable to reflected XSS
    21Monitor
  • ← EarlierCVE-2022-3281Oct 17, 2022 · WAGO: multiple products - Loss of MAC-Address-Filtering after reboot
    30Monitor

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.

No history yet (it accumulates with the daily EPSS job).

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.

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-secondary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

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

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records