What is CVE-2018-20336?

CVE-2018-20336 is a high-severity vulnerability in Asus Asuswrt-merlin, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2019-09-17.

How severe is CVE-2018-20336?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2018-20336 known to be exploited?

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

Buffer overflow in Asus Asuswrt-merlin

CVE-2018-20336

An issue was discovered in ASUSWRT 3.0.0.4.384.20308. There is a stack-based buffer overflow issue in parse_req_queries function in wanduck.c via a long string over UDP, which may lead to an information leak.

Vulnerability class: Buffer Overflow

EPSS: 0.020 (78.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Asus Asuswrt-merlin — versions 3.0.0.4.384.20308
Asus Rt-ac68u
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

JustPlay/pce-ac88_

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2018-20336?: CVE-2018-20336 is a high-severity vulnerability in Asus Asuswrt-merlin, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2019-09-17.
How severe is CVE-2018-20336?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2018-20336 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.