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CVE-2023-27332

TP-Link Archer AX21 tdpServer Logging Stack-based Buffer Overflow Remote Code Execution Vulnerability

HIGH
8.8
CVSS Score
Published: May 3, 2024 at 01:55 AM UTC
Updated: June 17, 2026 at 05:44 AM UTC
2 products affected across 1 vendorArcher AX21 FirmwareArcher AX21

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

TP-Link Archer AX21 tdpServer Logging Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link Archer AX21 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the logging functionality of the tdpServer program, which listens on UDP port 20002. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. . Was ZDI-CAN-19898.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Archer AX21 Firmware· TP-Link
95%
v < 32302191.1.3 build_20221125
Affected range stops below 3230219, so it looks safe — our inference, not a vendor statement
Archer AX21· TP-Link
90%
v < 32302191.1.3 Build 202211251.1.3 build_20221125
Affected range stops below 3230219, so it looks safe — our inference, not a vendor statement
tp-link-link-archer-ax21 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_research-advisoryThird Party Advisory
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-23-245/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHzdi
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121

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