What is CVE-2018-20198?

CVE-2018-20198 is a medium-severity vulnerability in Audiocoding Freeware Advanced Audio Decoder 2, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2018-12-18.

How severe is CVE-2018-20198?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Audiocoding Freeware Advanced Audio Decoder 2

CVE-2018-20198

A NULL pointer dereference was discovered in ifilter_bank of libfaad/filtbank.c in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8. The vulnerability causes a segmentation fault and application crash, which leads to denial of service because adding to windowed output is mishandled in the LONG_START_SEQUENCE case.

Published 2018-12-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Audiocoding Freeware Advanced Audio Decoder 2 — versions 2.8.8

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/knik0/faad2/issues/23 (Exploit, Third Party Advisory)
lists.debian.org/debian-lts-announce/2019/05/msg00022.html (mailing-list)
www.debian.org/security/2019/dsa-4522 (vendor-advisory)
seclists.org/bugtraq/2019/Sep/28 (mailing-list)
security.gentoo.org/glsa/202006-17 (vendor-advisory)

Frequently asked questions

What is CVE-2018-20198?: CVE-2018-20198 is a medium-severity vulnerability in Audiocoding Freeware Advanced Audio Decoder 2, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2018-12-18.
How severe is CVE-2018-20198?: Medium severity. CVSS v3 base score is 5.5 out of 10.