CVE-2018-8879 in the critical feed json
Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware before 3.0.0.4.382.50470 for dev…
published 2019-11-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2018-20487
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 16.7%
- EPSS 16.7% chance of exploitation in 30 days, percentile 97%
- public exploits
- 0
- none known
Summary
Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware before 3.0.0.4.382.50470 for devices allows remote attackers to execute arbitrary code by providing a long string to the blocking.asp page via a GET or POST request. Vulnerable parameters are flag, mac, and cat_id.
Patch / fix
- asus rt-ac66u_firmware 3.0.0.4.382.50470
Exploit prediction
16.71% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- pagedout.institute https://pagedout.institute/download/PagedOut_001_beta1.pdf referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
pagedout.institute
/download/PagedOut_001_beta1.pdf
exploit, third-party-advisory
-
asus.com
/Networking/RTAC66U/HelpDesk_BIOS
product
Sources
- CVE List CVE-2018-8879
- NVD CVE-2018-8879
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.