CVE-2026-31170: An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbi

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CRITICAL 9.8REMOTEMITIGATE

CVE-2026-31170 is a critical-severity flaw (CVSS 9.8) affecting a3300r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stun-pass parameter to /cgi-bin/cstecgi.cgi.

Why this priority

Critical severity
Public exploit reference
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	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-04-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: totolink

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

Am I affected?

Timeline

2026-04-09 19:16 UTCPublished CVE record published
2026-06-17 10:33 UTCUpdated Record last modified

totolink a3300r firmware MITIGATE

Affected: 17.0.0cu.557_b20221024

Fixed in: no fixed release known

Safe to downgrade to: a release before 17.0.0cu.557_b20221024

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 46 · python-googleapis-common-protos · FIXED · 1.75.5-1.fc46~bootstrap · FEDORA-2026-d911c4c4e6 · source

sudo dnf upgrade --advisory=FEDORA-2026-d911c4c4e6

Fedora ELN · see advisory · FIXED · FEDORA-2026-e3987c278f · source

sudo dnf upgrade --advisory=FEDORA-2026-e3987c278f

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/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-stun-pass-cmd-injection

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-2026-31170?

a3300r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-31170 being exploited?

CVE-2026-31170 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-2026-31170 affect?

CVE-2026-31170 affects a3300r firmware. Severity is critical (CVSS 9.8). An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stun-pass parameter to /cgi-bin/cstecgi.cgi.

How urgent is CVE-2026-31170?

Priority 59/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-5105 MEDIUM 6.3 MITIGATE A vulnerability was detected in Totolink A3300R 17.0.0cu.557_b20221024
CVE-2026-5104 MEDIUM 6.3 MITIGATE A security vulnerability has been detected in Totolink A3300R 17.0.0cu.557_b20221024
CVE-2026-5103 MEDIUM 6.3 MITIGATE A weakness has been identified in Totolink A3300R 17.0.0cu.557_b20221024
CVE-2026-5102 MEDIUM 6.3 MITIGATE A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024
CVE-2026-5101 MEDIUM 6.3 MITIGATE A vulnerability was identified in Totolink A3300R 17.0.0cu.557_b20221024

References

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