CVE-2026-31159: An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbi

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MEDIUM 6.5REMOTEMITIGATE

CVE-2026-31159 is a medium-severity flaw (CVSS 6.5) 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 password parameter to /cgi-bin/cstecgi.cgi.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-04-23
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

2026-04-23 18:16 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.

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-2026-31159?

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

Is CVE-2026-31159 being exploited?

CVE-2026-31159 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-2026-31159 affect?

CVE-2026-31159 affects a3300r firmware. Severity is medium (CVSS 6.5). An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the password parameter to /cgi-bin/cstecgi.cgi.

How urgent is CVE-2026-31159?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-31181 CRITICAL 9.8 MITIGATE An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbi
CVE-2026-31179 MEDIUM 6.5 MITIGATE An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbi
CVE-2026-31178 CRITICAL 9.8 MITIGATE An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbi
CVE-2026-31177 CRITICAL 9.8 MITIGATE An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbi
CVE-2026-31176 MEDIUM 6.5 MITIGATE An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbi

References

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