What is CVE-2021-35003?

CVE-2021-35003 is a critical-severity vulnerability in TP-Link Archer C90, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2022-01-21.

How severe is CVE-2021-35003?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-35003 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in TP-Link Archer C90

CVE-2021-35003

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-Link Archer C90 1.0.6 Build 20200114 rel.73164(5553) routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of DNS responses. A crafted DNS message can trigger an overflow of a fixed-length, stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-14655.

Vulnerability class: Buffer Overflow

EPSS: 0.077 (94.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Tp-link Archer C90 — versions 1.0.6 Build 20200114 rel.73164(5553)
Tp-link Archer_c90
Tp-link Archer_c90_firmware — versions 1.0.6

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

Public proof-of-concept exploits

References

zdi-disclosures@trendmicro.com (VDB Entry, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-35003?: CVE-2021-35003 is a critical-severity vulnerability in TP-Link Archer C90, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2022-01-21.
How severe is CVE-2021-35003?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-35003 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.