Is CVE-2017-16803 in the CISA KEV catalog?

No. CVE-2017-16803 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-16803?

CVE-2017-16803 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-16803?

CVE-2017-16803 has an EPSS score of 3.01% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-16803?

Upgrade ffmpeg on debian 11 to 7:2.2.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2017-16803

HIGHEPSS 86th pctl

7.5

CVSS v3

NVD

Description

In Libav through 11.11 and 12.x through 12.1, the smacker_decode_tree function in libavcodec/smacker.c does not properly restrict tree recursion, which allows remote attackers to cause a denial of service (bitstream.c:build_table() out-of-bounds read and application crash) via a crafted Smacker stream.

CWE-119Buffer Overflow

How to fix

Remediation Available

ffmpegDebian

Fixed in:7:2.2.1-1CVE-2017-16803

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

3.01%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Third-Party Advisory1

securityfocus.com

Issue Tracking2

Other references2

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.