CVE-2026-4903: A flaw has been found in Tenda AC5 15.03.06.47

This month

HIGH 8.8MITIGATE

CVE-2026-4903 is a high-severity flaw (CVSS 8.8) affecting ac5 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 AC5 15.03.06.47. This vulnerability affects the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. This manipulation of the argument PPPOEPassword causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been published and may be used.

Why this priority

High severity
EPSS top 7%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	5.7% (top 7%)
CISA exploited list	No
Weakness	CWE-119, CWE-121, CWE-787
Published	2026-03-26
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

2026-03-26 23:16 UTCPublished CVE record published
2026-06-17 10:57 UTCUpdated Record last modified

tenda ac5 firmware MITIGATE

Affected: 15.03.06.47

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.03.06.47

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · perl-Encode · FIXED · 3.25-528.eln159 · FEDORA-2026-79991d0238 · source

sudo dnf upgrade --advisory=FEDORA-2026-79991d0238

Fedora 46 · fonttools · FIXED · 4.68.0-1.fc46 · FEDORA-2026-65d6c01c75 · source

sudo dnf upgrade --advisory=FEDORA-2026-65d6c01c75

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-2026-4903?

ac5 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4903 being exploited?

CVE-2026-4903 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-2026-4903 affect?

CVE-2026-4903 affects ac5 firmware. Severity is high (CVSS 8.8). A flaw has been found in Tenda AC5 15.03.06.47. This vulnerability affects the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. This manipulation of the argument PPPOEPassword causes stack-based

How urgent is CVE-2026-4903?

Priority 59/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2026-4906 HIGH 8.8 MITIGATE A vulnerability was determined in Tenda AC5 15.03.06.47
CVE-2026-4905 HIGH 8.8 MITIGATE A vulnerability was found in Tenda AC5 15.03.06.47
CVE-2026-4904 HIGH 8.8 MITIGATE A vulnerability has been found in Tenda AC5 15.03.06.47
CVE-2026-4902 HIGH 8.8 MITIGATE A vulnerability was detected in Tenda AC5 15.03.06.47

References

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