7.5

CVE-2021-3128: asus rt-ac1750_b1_firmware Excessive Iteration

CVSS: 7.5v3.1HighModified
Published 12-04-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-3128 is a high (CVSS 7.5) Excessive Iteration vulnerability in asus rt-ac1750_b1_firmware. EPSS estimates a 2.18% chance of exploitation in the next 30 days, higher than 82.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
2.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-04-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

In ASUS RT-AX3000, ZenWiFi AX (XT8), RT-AX88U, and other ASUS routers with firmware < 3.0.0.4.386.42095 or < 9.0.0.4.386.41994, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

2.18%

Chance of exploitation in the next 30 days

Percentile

82%

Versus all other CVEs

30-day change

0.00 pp

From 2.18% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.18%

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

Asus27 products

1 vendor · 27 products

References

27 links
Show all 27 references