How severe is CVE-2026-31177?

CVE-2026-31177 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-31177 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31177?

CVE-2026-31177 affects Totolink A3300r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31177?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-31177 have an EU (EUVD) identifier?

Yes. CVE-2026-31177 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25245.

When was CVE-2026-31177 published?

CVE-2026-31177 was published on 2026-04-23 and last updated on 2026-06-17.

CVE-2026-31177

CVE-2026-31177 is a critical-severity vulnerability in Totolink A3300r Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25245
Weakness: CWE-78
Affected product: Totolink A3300r Firmware
Published: 2026-04-23
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-31177?: An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMinAlive parameter to /cgi-bin/cstecgi.cgi.
How severe is CVE-2026-31177?: CVE-2026-31177 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-31177 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31177?: CVE-2026-31177 affects Totolink A3300r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31177?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-31177 have an EU (EUVD) identifier?: Yes. CVE-2026-31177 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25245.
When was CVE-2026-31177 published?: CVE-2026-31177 was published on 2026-04-23 and last updated on 2026-06-17.

References

https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-stun-min-alive-cmd-injection

Affected products (1)

cpe:2.3:o:totolink:a3300r_firmware:17.0.0cu.557_b20221024:*:*:*:*:*:*:*

More vulnerabilities in Totolink A3300r Firmware

CVE-2026-31181 — Critical (CVSS 9.8): An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary…
CVE-2026-31178 — Critical (CVSS 9.8): An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary…
CVE-2026-31175 — Critical (CVSS 9.8): An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary…
CVE-2026-31170 — Critical (CVSS 9.8): An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary…
CVE-2025-52046 — Critical (CVSS 9.8): Totolink A3300R V17.0.0cu.596_B20250515 was found to contain a command injection vulnerability in the sub_4197C0…
CVE-2024-24333 — Critical (CVSS 9.8): TOTOLINK A3300R V17.0.0cu.557_B20221024 was discovered to contain a command injection vulnerability via the desc…

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