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Public proof of concept

CVE-2021-27246

A public proof of concept exists; no exploitation attested.

  • Published2021-04-14
  • WeaknessCWE-121

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link Archer A7 AC1750 1.0.15 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of MAC addresses by the tdpServer endpoint. A crafted TCP message can write stack pointers to the stack. An attacker can leverage this vulnerability to execute code in the context of the root user. Was ZDI-CAN-12306.

Timeline

dates in UTC
  1. 2021-04-1416:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27246?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27246?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Tp-link ac1750 firmwareversion to verify
BranchAffectedFixed in
1.0= 1.0.15no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedsynacktiv/CVE-2021-27246_Pwn2Own2020
PoC-in-GitHub

Sources

  • NVDCVSS 3.18read 2026-10-23
  • CNACVSS 3.08read 2026-10-23
  • NVDCVSS 2.07.9read 2026-10-23
  • CNAweakness (CWE)CWE-121read 2026-10-23
  • FIRST EPSSEPSS score6.6 %2026-10-22
  • PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-04-14
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-27246?

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link Archer A7 AC1750 1.0.15 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of MAC addresses by the tdpServer endpoint. A crafted TCP message can write stack pointers to the stack. An attacker can leverage this vulnerability to execute code in the context of the root user. Was ZDI-CAN-12306.

Is CVE-2021-27246 actively exploited?

Active exploitation of CVE-2021-27246 has not been confirmed. Its EPSS score was 6.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27246?

CVE-2021-27246 has a CVSS v3 base score of 8 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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