How severe is CVE-2018-20198?

CVE-2018-20198 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-20198 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20198?

CVE-2018-20198 affects Audiocoding Freeware Advanced Audio Decoder 2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20198?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-20198 published?

CVE-2018-20198 was published on 2018-12-18 and last updated on 2026-06-17.

CVE-2018-20198

CVE-2018-20198 is a medium-severity vulnerability in Audiocoding Freeware Advanced Audio Decoder 2 with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Audiocoding Freeware Advanced Audio Decoder 2
Published: 2018-12-18
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2018-20198?: CVE-2018-20198 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-20198 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20198?: CVE-2018-20198 affects Audiocoding Freeware Advanced Audio Decoder 2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20198?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20198 published?: CVE-2018-20198 was published on 2018-12-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:audiocoding:freeware_advanced_audio_decoder_2:2.8.8:*:*:*:*:*:*:*

More vulnerabilities in Audiocoding Freeware Advanced Audio Decoder 2

CVE-2019-15296 — High (CVSS 7.8): An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8. The faad_resetbits function in…
CVE-2018-20197 — High (CVSS 7.8): There is a stack-based buffer underflow in the third instance of the calculate_gain function in libfaad/sbr_hfadj.c in…
CVE-2018-20196 — High (CVSS 7.8): There is a stack-based buffer overflow in the third instance of the calculate_gain function in libfaad/sbr_hfadj.c in…
CVE-2018-20194 — High (CVSS 7.8): There is a stack-based buffer underflow in the third instance of the calculate_gain function in libfaad/sbr_hfadj.c in…
CVE-2018-19504 — High (CVSS 7.8): An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.1. There is a NULL pointer dereference in…
CVE-2018-19503 — High (CVSS 7.8): An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.1. There was a stack-based buffer overflow in…

All CVEs affecting Audiocoding Freeware Advanced Audio Decoder 2 →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →