What is CVE-2025-57638?

CVE-2025-57638 is a high-severity vulnerability in Tenda Ac9, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-09-23.

How severe is CVE-2025-57638?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-57638 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Tenda Ac9

CVE-2025-57638

Buffer overflow vulnerability in Tenda AC9 1.0 via the user supplied sys.vendor configuration value.

Vulnerability class: Buffer Overflow

Published 2025-09-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Tenda Ac9
Tenda Ac9 Firmware — versions 1.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

github.com/glkfc/IoT-Vulnerability/blob/main/Tenda/tenda1.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-57638?: CVE-2025-57638 is a high-severity vulnerability in Tenda Ac9, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-09-23.
How severe is CVE-2025-57638?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-57638 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.