CVE-2026-5976: A security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024

This week

CRITICAL 9.8REMOTE

CVE-2026-5976 is a critical-severity flaw (CVSS 9.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function setStorageCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument sambaEnabled results in os command injection. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

Why this priority

Critical severity
CISA SSVC: public proof of concept
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-77, CWE-78
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): VulDB

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-04-09 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · ruff · FIXED · 0.17.3-1.fc46 · FEDORA-2026-63898fdcbb · source

sudo dnf upgrade --advisory=FEDORA-2026-63898fdcbb

Fedora ELN · xorg-x11-server-Xwayland · FIXED · 26.0.99.903-2.eln159 · FEDORA-2026-4581dab0ed · source

sudo dnf upgrade --advisory=FEDORA-2026-4581dab0ed

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_162/README.md

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-2026-5976?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-5976 being exploited?

CVE-2026-5976 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-2026-5976 affect?

CVE-2026-5976 affects affected software. Severity is critical (CVSS 9.8). A security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function setStorageCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument sambaEnabled resu

How urgent is CVE-2026-5976?

Priority 65/100. Critical severity; CISA SSVC: public proof of concept; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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