How severe is CVE-2026-4253?

CVE-2026-4253 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-4253 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4253?

CVE-2026-4253 affects Tenda Ac8 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4253?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4253 have an EU (EUVD) identifier?

Yes. CVE-2026-4253 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12472.

When was CVE-2026-4253 published?

CVE-2026-4253 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-4253

CVE-2026-4253 is a medium-severity vulnerability in Tenda Ac8 Firmware with a CVSS 3.x base score of 4.7. 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: Medium (CVSS 3.x base score 4.7)
CVSS v2: 5.8
CVSS v4: 2.0
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12472
Weakness: CWE-78
Affected product: Tenda Ac8 Firmware
Published: 2026-03-16
Last modified: 2026-06-17

Description

A security flaw has been discovered in Tenda AC8 16.03.50.11. This affects the function route_set_user_policy_rule of the file /cgi-bin/UploadCfg of the component Web Interface. The manipulation of the argument wans.policy.list1 results in os command injection. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.

Frequently asked questions

What is CVE-2026-4253?: A security flaw has been discovered in Tenda AC8 16.03.50.11. This affects the function route_set_user_policy_rule of the file /cgi-bin/UploadCfg of the component Web Interface. The manipulation of the argument wans.policy.list1 results in os command injection. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.
How severe is CVE-2026-4253?: CVE-2026-4253 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-4253 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4253?: CVE-2026-4253 affects Tenda Ac8 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4253?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4253 have an EU (EUVD) identifier?: Yes. CVE-2026-4253 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12472.
When was CVE-2026-4253 published?: CVE-2026-4253 was published on 2026-03-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ac8_firmware:16.03.50.11:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac8 Firmware

CVE-2026-4254 — Critical (CVSS 9.8): A weakness has been identified in Tenda AC8 up to 16.03.50.11. This vulnerability affects the function doSystemCmd of…
CVE-2026-4252 — Critical (CVSS 9.8): A vulnerability was identified in Tenda AC8 16.03.50.11. Affected by this issue is the function check_is_ipv6 of the…
CVE-2025-29100 — Critical (CVSS 9.8): Tenda AC8 V16.03.34.06 is vulnerable to Buffer Overflow in the fromSetRouteStatic function via the parameter list.
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CVE-2025-25667 — Critical (CVSS 9.8): Tenda AC8V4 V16.03.34.06 was discovered to contain a stack overflow via the urls parameter in the function…
CVE-2025-25664 — Critical (CVSS 9.8): Tenda AC8V4 V16.03.34.06 was discovered to contain a stack overflow via the shareSpeed parameter in the sub_49E098…

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