CVE-2026-24110: Tenda W20E · Classic Buffer Overflow
Source CVE Database V5
Not known to be exploited · CVSS 9.8 Critical.
Data as of 26 Oct 2026, 15:59 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 2 Mar 2026
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 26 Oct 2026.
What to do
AI-suggested
Organizations should immediately inventory their network to identify Tenda W20E routers running the vulnerable firmware version V4.0br_V15.11.0.6. Since no official patches are currently available, network administrators should implement compensating controls such as restricting access to router management interfaces and DHCP services to trusted internal networks only. Deploy network-level filtering to block suspicious or malformed DHCP traffic, especially from untrusted sources. Monitor network traffic for unusual DHCP rule submissions and anomalous router behavior. Engage with Tenda support channels to obtain firmware updates or security advisories. Consider replacing vulnerable devices with models from vendors with stronger security track records if timely patches are not forthcoming. Additionally, apply network segmentation to limit the impact of potential router compromise. Regularly update router firmware once patches become available and validate the integrity of network devices through security assessments.
Description
An issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may send overly long `addDhcpRules` data. When these rules enter the `addDhcpRule` function and are processed by `ret = sscanf(pRule, " %d\t%[^\t]\t%[^\n\r\t]", &dhcpsIndex, dhcpsIP, dhcpsMac);`, the lack of size validation for the rules could lead to buffer overflows in `dhcpsIndex`, `dhcpsIP`, and `dhcpsMac`.