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01 Record

CVE-2021-27245

This vulnerability allows a firewall bypass on affected installations of TP-Link Archer A7 prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220 AC1750 routers. Authentication is not required

HighPUBLISHEDCNA: zdi
CNA base score8.1 CVSS v3.xCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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02 Description

This vulnerability allows a firewall bypass on affected installations of TP-Link Archer A7 prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220 AC1750 routers. Authentication is not required

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
3.32% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 88.4% of scored records. A rank, not a probability.
NVD base score
8.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-03-29 21:05Z5 YR AGO
Last updated
2024-08-03 20:48Z2 YR AGO
Reserved
2021-02-16
Assigning CNA
zdi
Record state
PUBLISHED
Severity
High (CVSS 8.1)
CNA CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-693Protection Mechanism FailurePillar
Data version
5.1
Document digest
c4ddbd66eb66ed65a47d8b9cb9f4f92126914789e11c92d98c94400f6d277f89

05 Affected products

VendorProductVersionsPlatforms
TP-LinkArcher A7prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220—

06 References