8.8

CVE-2018-5721: asuswrt-merlin Out-of-bounds Write

CVSS: 8.8v3.1HighModified
Published 17-01-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-5721 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in asuswrt-merlin. EPSS estimates a 1.94% chance of exploitation in the next 30 days, higher than 79.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
46/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
1.94%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 17-01-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RMerl/asuswrt-merlin) allows web authenticated attackers to execute code via a request that updates a setting. In ej_update_variables, the length of the variable action_script is not checked, as long as it includes a "_wan_if" substring.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.94%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 1.94% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.94%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (w0lfzhang.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Asuswrt-merlin1 product

1 vendor · 1 product

References

1 links