CVE-2024-39802: Wavlink AC3000 · Classic Buffer Overflow
Affects Wavlink AC3000Source CVE Database V5
Not known to be exploited · CVSS 9.1 Critical.
Data as of 25 Oct 2026, 19:02 UTC
- EPSS
- 0.9% chance of exploitation in 30 days – higher than 59% 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:HExploitation evidence
Disclosed: evidence found.
CVE published 14 Jan 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 2026-10-25.
What to do
AI-suggested
1. Immediately restrict access to the router’s management interface to trusted networks and users only, preferably via VPN or secure management VLANs. 2. Enforce strong authentication policies, including complex passwords and, if supported, multi-factor authentication for router access. 3. Monitor network traffic and device logs for unusual HTTP POST requests targeting qos.cgi or anomalous behavior indicative of exploitation attempts. 4. Disable QoS features or the qos.cgi interface if not essential, reducing the attack surface. 5. Maintain an inventory of all Wavlink AC3000 devices and verify firmware versions to identify vulnerable units. 6. Engage with Wavlink support channels to obtain and apply firmware updates or patches as soon as they become available. 7. Implement network segmentation to isolate critical devices and limit the spread of compromise. 8. Conduct regular security assessments and penetration tests focusing on network infrastructure devices. 9. Educate network administrators about this vulnerability and the importance of secure device management practices.
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_dat` POST parameter.