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VulnerabilityPublished

CVE-2026-24110: Tenda W20E · Classic Buffer Overflow

Source CVE Database V5

0

Not known to be exploited · CVSS 9.8 Critical.

Data as of 26 Oct 2026, 15:59 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Mar 2026

  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 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`.

References

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