CVE-2026-5021: A flaw has been found in Tenda F453 1.0.0.3

This month

HIGH 8.8MITIGATE

CVE-2026-5021 is a high-severity flaw (CVSS 8.8) affecting f453 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw has been found in Tenda F453 1.0.0.3. This affects the function fromPPTPUserSetting of the file /goform/PPTPUserSetting of the component httpd. This manipulation of the argument delno causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-119, CWE-121, CWE-787
Published	2026-03-29
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: tenda

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-29 02:16 UTCPublished CVE record published
2026-06-17 10:58 UTCUpdated Record last modified

tenda f453 firmware MITIGATE

Affected: 1.0.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-5021?

f453 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-5021 being exploited?

CVE-2026-5021 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-5021 affect?

CVE-2026-5021 affects f453 firmware. Severity is high (CVSS 8.8). A flaw has been found in Tenda F453 1.0.0.3. This affects the function fromPPTPUserSetting of the file /goform/PPTPUserSetting of the component httpd. This manipulation of the argument delno causes stack-based buffer overflow. Remote exploi

How urgent is CVE-2026-5021?

Priority 48/100. High severity; Public exploit reference

Software pages

Apache HTTP Server vulnerabilities

Related CVEs

CVE-2026-6989 MEDIUM 6.3 MITIGATE A vulnerability has been found in Tenda F453 up to 1.0.0.3
CVE-2026-4554 MEDIUM 6.3 MITIGATE A security flaw has been discovered in Tenda F453 1.0.0.3
CVE-2026-4553 HIGH 8.8 MITIGATE A vulnerability was identified in Tenda F453 1.0.0.3
CVE-2026-4552 HIGH 8.8 MITIGATE A vulnerability was determined in Tenda F453 1.0.0.3
CVE-2026-4551 HIGH 8.8 MITIGATE A vulnerability was found in Tenda F453 1.0.0.3

References

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