⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● High · CVSS 8.7

How to Fix CVE-2026-22080: Critical Vulnerability in 300Mbps Wireless Router F3 and N300 Easy Setup Router

Other vulnerabilities in the same area that are worth patching alongside this one:

*By Sai Kiran Pandrala*

⚡ At a glance
SeverityCVSS 8.7 - High
Actively exploited?Not currently listed in CISA KEV
AffectedF3 v3.0 Firmware V12.01.01.41, F3 v3.0 Firmware V12.01.01.42, F3 v3.0 Firmware V12.01.01.48, F3 v3.0 Firmware V12.01.01.52, F3 v3.0 Firmware V12.01.01.55, F3 v4.0 Firmware V03.03.01.40
Fixed inSee vendor advisory
Type (CWE)CWE-319: Cleartext Transmission of Sensitive Information

What is CVE-2026-22080?

CVE-2026-22080 is a security flaw in 300Mbps Wireless Router F3 and N300 Easy Setup Router. This vulnerability exists in Tenda wireless routers (300Mbps Wireless Router F3 and N300 Easy Setup Router) due to the transmission of credentials encoded using reversible Base64 encoding through the web-based administrative interface. An attacker on the same network could exploit this vulnerability by intercepting network traffic and capturing the Base64-encoded credentials.

Why this CVE matters

Unpatched network-facing software is the leading initial-access vector in public breach reporting. Treat any CVSS-9 class flaw on an internet-reachable system as urgent, regardless of whether public exploit code has been observed yet.

For deployments of 300Mbps Wireless Router F3 and N300 Easy Setup Router that have been exposed to the public internet during the disclosure window, the operating assumption should be that scanning has already happened. Even where exploitation has not been publicly observed, scanning for the vulnerable fingerprint is cheap and routine. Patching closes the door; log review and credential rotation close out the rest of the response.

Am I affected?

You are affected if your installation matches any of these version ranges:

Check your installed version against the list above. If you cannot determine the version, treat the system as affected and follow the upgrade path below.

Open 300Mbps Wireless Router F3 and N300 Easy Setup Router's About dialog or run the vendor-documented version-check command. Compare the result against the affected ranges in the advisory.

How to fix CVE-2026-22080

  1. Read the vendor advisory in full: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0004
  2. Upgrade 300Mbps Wireless Router F3 and N300 Easy Setup Router to the patched build listed in the vendor advisory.
  3. Back up the configuration (and database, where applicable) before upgrading.
  4. Apply the patch in a maintenance window. For HA pairs, upgrade the standby node first, fail over, then upgrade the former primary.
  5. Restart the affected service so the patched binary loads, then verify the new version (see verification section).

Network appliance upgrade

_Verify the exact patched build against the vendor advisory: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0004_


# Vendor advisory: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0004
# 1. Confirm the running firmware on 300Mbps Wireless Router F3 and N300 Easy Setup Router
show version

# 2. Download the patched image from the vendor support portal and verify SHA256
sha256sum 300mbps-wireless-router-f3-and-n300-easy-setup-router-<patched-version>.img

# 3. Apply via the vendor's documented upgrade procedure (TFTP / SCP / USB)
# 4. Reboot, then re-run the version command to confirm the patched build loaded
show version

Verify the fix landed


# 1. Confirm the running version matches the patched build
#    (target per advisory: see vendor advisory)
#    Use the platform-specific version probe shown above.

# 2. Re-scan the host with your vulnerability scanner (Nessus, Qualys, Tenable,
#    Rapid7, OpenVAS). The scanner should no longer flag CVE-2026-22080.

# 3. Inspect service and kernel logs for crash-loops or rollback events
journalctl --since "10 minutes ago" | grep -iE 'error|fail|panic'
dmesg --since "10 minutes ago" | tail -50

If you cannot patch immediately

No official workaround exists beyond restricting network exposure to the affected component. Apply the vendor patch as the primary remediation.

How to verify the fix worked

If your installation was internet-reachable during the disclosure window, treat log review as part of the remediation rather than an optional follow-up. Look for log entries that do not match your normal request patterns, especially repeated requests to the same uncommon endpoint, and any administrative changes you cannot tie back to a known operator.

Frequently asked questions

Is CVE-2026-22080 being exploited in the wild?

Public exploitation has not been confirmed by CISA at the time of writing. Treat the patch as time-sensitive anyway; reports often lag actual abuse.

Will a WAF or IDS rule fully mitigate CVE-2026-22080?

No. Network-layer filters can reduce noise and slow opportunistic scanners, but they will not stop a determined attacker. The vendor patch is the only durable fix.

How long should I plan for the upgrade?

Typical vendor-documented upgrade windows for 300Mbps Wireless Router F3 and N300 Easy Setup Router run from a few minutes to under an hour depending on cluster size. Test in a staging environment first and follow the vendor's documented HA upgrade order.

References

*This guide was assembled from the official vendor advisory, the NVD record, and the CISA KEV catalog entry on 2026-05-25. Always confirm against the vendor advisory before applying changes in production.*