CVE-2021-27246Public exploit

Root code execution via tdpServer stack overwrite

Published Apr 14, 2021 · Updated Aug 3, 2024

Stack-based buffer overflow in TP-Link Archer A7 AC1750 1.0.15 allows network-adjacent attackers to execute arbitrary code as root. tdpServer handles attacker-controlled MAC addresses from crafted TCP messages in a way that writes stack pointers onto its stack. The attacker must be on an adjacent network, and authentication is not required; successful exploitation grants full control of the router.

CVSS severity8.0
High
EPSS probability6.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TP-Link Archer A7 AC1750 1.0.15 allows network-adjacent attackers to execute arbitrary code as root. tdpServer handles attacker-controlled MAC addresses from crafted TCP messages in a way that writes stack pointers onto its stack. The attacker must be on an adjacent network, and authentication is not required; successful exploitation grants full control of the router.

The record

CVE
CVE-2021-27246
Published
Apr 14, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.0Zero Day InitiativeCVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.0NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.9NIST NVDAV:A/AC:M/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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