CVE-2026-5853: A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024

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CRITICAL 9.8REMOTE

CVE-2026-5853 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 vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument addrPrefixLen leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
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	13.5% (top 4%)
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 07:16 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_159/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-2026-5853?

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

Is CVE-2026-5853 being exploited?

CVE-2026-5853 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-2026-5853 affect?

CVE-2026-5853 affects affected software. Severity is critical (CVSS 9.8). A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argume

How urgent is CVE-2026-5853?

Priority 69/100. Critical severity; EPSS top 4%: very likely to be exploited; 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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