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VulnerabilityPublished Updated

CVE-2024-39801: Wavlink AC3000 · Classic Buffer Overflow

Affects Wavlink AC3000Source CVE Database V5

0

Not known to be exploited · CVSS 9.1 Critical.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
1.3% chance of exploitation in 30 days – higher than 71% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Jan 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

AI-suggested

Organizations should immediately audit their networks to identify any Wavlink AC3000 devices running the vulnerable firmware version M33A8.V5030.210505. Until a patch is available, restrict access to the router's management interface by implementing network segmentation and firewall rules to limit HTTP access to trusted administrators only. Enforce strong authentication mechanisms and change default or weak passwords to reduce the risk of credential compromise. Monitor network traffic and device logs for unusual activity indicative of exploitation attempts. Disable QoS management interfaces if not required or restrict their usage. Consider deploying network intrusion detection systems (IDS) with signatures tuned to detect anomalous HTTP POST requests targeting qos.cgi. Engage with Wavlink support channels to obtain firmware updates or security advisories. For critical environments, consider replacing vulnerable devices with models from vendors with faster security response capabilities. Regularly back up device configurations and ensure incident response plans include scenarios involving router compromise.

Description

Multiple buffer overflow vulnerabilities exist in the qos.cgi qos_settings() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to stack-based buffer overflow. An attacker can make an authenticated HTTP request to trigger these vulnerabilities.A buffer overflow vulnerability exists in the `qos_bandwidth` POST parameter.

References

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