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Ws C2940 8tf S FirmwareOperating system · Cisco

CVE-2022-31734

MEDIUM · 6.1 CVSS v3.1 Published 2022-06-20
Fix available
A fix is available. Upgrade to 12.2 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Cisco Catalyst 2940 Series Switches provided by Cisco Systems, Inc. contain a reflected cross-site scripting vulnerability regarding error page generation. An arbitrary script may be executed on the web browser of the user who is using the product. The affected firmware is prior to 12.2(50)SY released in 2011, and Cisco Catalyst 2940 Series Switches have been retired since January 2015

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A reflected cross-site scripting (XSS) vulnerability exists in the web interface error page generation of Cisco Catalyst 2940 Series Switches. An attacker can inject arbitrary JavaScript through malicious input in error page parameters, which executes in the context of the victim's browser when they interact with the crafted URL.

MitigationUpgrade affected devices to firmware version 12.2(50)SY or later. Since the product was retired in January 2015 and no longer receives security updates, consider replacing end-of-life devices with currently supported hardware.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ws C2940 8tf S FirmwareOperating system
Affected:< 12.2\(50\)sy
Ws C2940 8tt S FirmwareOperating system
Affected:< 12.2\(50\)sy

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm device model
    Identify the exact Cisco Catalyst 2940 model by checking the device label or using the 'show version' command via console or telnet/SSH. Only WS-C2940-8TF-S and WS-C2940-8TT-S are affected by this CVE.
    Affected if Device model is WS-C2940-8TF-S or WS-C2940-8TT-S
  2. Check firmware version
    Use the 'show version' command to display the running firmware version. Compare the displayed version against 12.2(50)SY - versions below this threshold are affected.
    Affected if Firmware version is below 12.2(50)SY
  3. Verify web interface is enabled
    Check if the HTTP or HTTPS web interface is active by reviewing the device configuration. Use 'show running-config | include http' or check the ip http server / ip https server status.
    Affected if HTTP or HTTPS server is enabled on the device
  4. Assess network accessibility
    Determine if the device web interface is reachable from untrusted networks by reviewing ACLs and network exposure. The XSS requires a victim to access a crafted URL.
    Affected if Web interface is accessible from networks where potential victims could be directed to malicious links

Device is affected only if it is a WS-C2940-8TF-S or WS-C2940-8TT-S running firmware below 12.2(50)SY with the web interface enabled and accessible to potential victims.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 12.2 or later
Fixed in 12.2
Interim mitigation

Upgrade affected devices to firmware version 12.2(50)SY or later. Since the product was retired in January 2015 and no longer receives security updates, consider replacing end-of-life devices with currently supported hardware.

Recommended fix High confidence

12.2(50)SY or later

  1. 1. Verify current firmware version by accessing the switch management interface or using 'show version' command
  2. 2. Download firmware version 12.2(50)SY or later from Cisco's official firmware repository
  3. 3. Review Cisco Catalyst 2940 upgrade documentation and release notes for compatibility requirements
  4. 4. Back up current switch configuration using 'copy running-config tftp' or similar method
  5. 5. Upload the new firmware to the switch's flash memory
  6. 6. Set the new firmware as the boot image using 'boot system' command
  7. 7. Reload the switch to apply the new firmware
  8. 8. Verify the upgrade was successful and confirm the new version using 'show version'
Caveat Upgrading from very old firmware may cause configuration compatibility issues; ensure backup and test in non-production environment first

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ws C2940 8tf S Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-31734 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data