9.3

CVE-2021-27245: tp-link archer_a7_firmware Protection Mechanism Failure

CVSS: 9.3v2.0HighModified
Published 29-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-27245 is a high (CVSS 9.3) Protection Mechanism Failure vulnerability in tp-link archer_a7_firmware. EPSS estimates a 3.33% chance of exploitation in the next 30 days, higher than 88.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.3/10
010
High · v2.0 (NVD)
EPSS score
3.33%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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 to exploit this vulnerability. The specific flaw exists within the handling of IPv6 connections. The issue results from the lack of proper filtering of IPv6 SSH connections. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-12309.

CVSS metrics

4 scores · 2 sources · 3 versions

EPSS trend

Probability

3.33%

Chance of exploitation in the next 30 days

Percentile

89%

Versus all other CVEs

30-day change

+0.11 pp

From 3.21% on 21-09-2026

21-09-202621-10-2026
EPSS score
3.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Tp-link1 product
  • archer_a7_firmwareprior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220 | < c7\(us\)_v5_210125 | < a7\(us\)_v5_200220

1 vendor · 1 product

References

1 links