CVE-2018-20199: A NULL pointer dereference was discovered in ifilter_bank of libfaad/filtbank.c in Freeware Advanced Audio Dec

Q: How do I fix CVE-2018-20199?

freeware advanced audio decoder 2: upgrade to 2.9.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2018-20199 being exploited?

CVE-2018-20199 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-20199 affect?

CVE-2018-20199 affects freeware advanced audio decoder 2, debian linux. Severity is medium (CVSS 5.5). 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 becaus

Q: How urgent is CVE-2018-20199?

Priority 46/100. Public exploit reference; On your watchlist

This month

MEDIUM 5.5WATCHLISTUPGRADEMITIGATE

CVE-2018-20199 is a medium-severity flaw (CVSS 5.5) affecting freeware advanced audio decoder 2, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ONLY_LONG_SEQUENCE case.

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-476
Published	2018-12-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: audiocoding · debian

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-18 01:29 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

audiocoding freeware advanced audio decoder 2 UPGRADE

Affected: < 2.9.0

Fixed in: 2.9.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy freeware-advanced-audio-decoder-2 || rpm -q freeware-advanced-audio-decoder-2 || freeware-advanced-audio-decoder-2 --version

2. UPGRADE to 2.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freeware-advanced-audio-decoder-2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freeware-advanced-audio-decoder-2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-20199?

freeware advanced audio decoder 2: upgrade to 2.9.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20199 being exploited?

CVE-2018-20199 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-20199 affect?

CVE-2018-20199 affects freeware advanced audio decoder 2, debian linux. Severity is medium (CVSS 5.5). 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 becaus

How urgent is CVE-2018-20199?

Priority 46/100. Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2019-6956 HIGH 7.1 UPGRADE MITIGATE An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8
CVE-2019-15296 HIGH 7.8 DOWNGRADE MITIGATE An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8
CVE-2018-20362 MEDIUM 5.5 DOWNGRADE A NULL pointer dereference was discovered in ifilter_bank of libfaad/filtbank.c in Freeware Advanced Audio Dec
CVE-2018-20361 MEDIUM 5.5 DOWNGRADE An invalid memory address dereference was discovered in the hf_assembly function of libfaad/sbr_hfadj.c in Fre
CVE-2018-20360 MEDIUM 5.5 UPGRADE MITIGATE An invalid memory address dereference was discovered in the sbr_process_channel function of libfaad/sbr_dec.c

References

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