Skip to content
Noroxi
NVD / CVE Program· CNA CERTVDE

CVE-2021-20997: WAGO: Managed Switches: Unauthorized access to password hashes

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 1% (FIRST EPSS); higher than 63.5% 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 multiple managed switches by WAGO in different versions it is possible to read out the password hashes of all Web-based Management users.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
May 13, 2021
Updated
Jun 16, 2026
EPSS
1.0% · 63th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

CNA vs NVD score

NVD
7.5
CNA · CERTVDE
7.5
agree

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-2021-20997

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.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for wago records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
wago0852-0303 firmware
wago0852-0303
wago0852-1305 firmware
wago0852-1305
wago0852-1505 firmware
wago0852-1505
wago0852-1305\/000-001 firmware
wago0852-1305\/000-001
wago0852-1505\/000-001 firmware
wago0852-1505\/000-001

Affected versions

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

  • wago 0852-0303 firmwareup to 1.2.3.s0 inclusive
  • wago 0852-1305 firmwareup to 1.1.7.s0 inclusive
  • wago 0852-1305/000-001 firmwareup to 1.0.4.s0 inclusive
  • wago 0852-1505 firmwareup to 1.1.6.s0 inclusive
  • wago 0852-1505/000-001 firmwareup to 1.0.4.s0 inclusive

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 0852-0303

    • unspecified and later · up to and including V1.2.3.S0affected

  • WAGO 0852-1305

    • unspecified and later · up to and including V1.1.7.S0affected

  • WAGO 0852-1305/000-001

    • unspecified and later · up to and including V1.0.4.S0affected

  • WAGO 0852-1505

    • unspecified and later · up to and including V1.1.6.S0affected

  • WAGO 0852-1505/000-001

    • unspecified and later · up to and including V1.0.4.S0affected

Same product

wago: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-20998WAGO: Managed Switches: Unauthorized creation of user accounts
    39Monitor
  • CVE-2021-20995WAGO: Managed Switches: Storage of user credentials in a cookie
    30Monitor
  • CVE-2021-20994WAGO: Managed Switches: Reflected Cross-site Scripting
    24Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-20993May 13, 2021 · WAGO: Managed Switches: Exposure of sensitive information through directory listing
    21Monitor
  • ← EarlierCVE-2021-20996May 13, 2021 · WAGO: Managed Switches: Unsecure Cookie settings
    21Monitor

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
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-522 · Insufficiently Protected Credentials

CVSS vector

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

References

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

All records