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CVE-2023-6601· NVD / CVE Program· CNA fedora

Ffmpeg: hls unsafe file extension bypass in ffmpeg

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.41% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: github.com/FFmpeg/FFmpeg FFmpeg 6.*.

Low priority for now. Upgrade to github.com/FFmpeg/FFmpeg FFmpeg 6.* or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in FFmpeg's HLS demuxer. This vulnerability allows bypassing unsafe file extension checks and triggering arbitrary demuxers via base64-encoded data URIs appended with specific file extensions.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Jan 6, 2025
Updated
Jun 17, 2026
EPSS
0.4% · 34th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · fedora
4.7
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-6601

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
ffmpegffmpeg

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • ffmpeg ffmpeg2.0 and later · up to 6.0 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (fedora). Independent of NVD's CPE analysis and usually ahead of it.

  • github.com/FFmpeg/FFmpeg FFmpeg

    • 2.0 and later · before 6.*affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12ffmpegfrom 0—
Debian:13ffmpegbefore 7:6.1-17:6.1-1
openSUSE:Leap 15.6ffmpeg-4before 4.4.6-150600.13.38.14.4.6-150600.13.38.1
openSUSE:Leap 16.0ffmpeg-7before 7.1.4-160000.1.17.1.4-160000.1.1
openSUSE:Tumbleweedffmpeg-4before 4.4.6-10.14.4.6-10.1
openSUSE:Tumbleweedffmpeg-7before 7.1.3-1.17.1.3-1.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSffmpeg-4before 4.4.7-150400.3.67.14.4.7-150400.3.67.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSffmpeg-4before 4.4.6-150400.3.60.14.4.6-150400.3.60.1
SUSE:Linux Enterprise Module for Package Hub 15 SP7ffmpeg-4before 4.4.7-150600.13.47.14.4.7-150600.13.47.1
SUSE:Linux Enterprise Module for Package Hub 15 SP7ffmpeg-4before 4.4.6-150600.13.38.14.4.6-150600.13.38.1

Same product

ffmpeg: all records

Other highest-scoring records for the same primary product.

  • CVE-2009-4637FFmpeg 0.5 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unknown vectors that trigger
    45Plan
  • CVE-2016-10190Heap-based buffer overflow in libavformat/http.c in FFmpeg before 2.8.10, 3.0.x before 3.0.5, 3.1.x before 3.1.6, and 3.2.x before 3.2.2 all
    42Plan
  • CVE-2009-4634Multiple integer underflows in FFmpeg 0.5 allow remote attackers to cause a denial of service and possibly execute arbitrary code via a craf
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2024-35365Jan 3, 2025 · FFmpeg version n6.1.1 has a double-free vulnerability in the fftools/ffmpeg_mux_init.c component of FFmpeg, specifically within the new_stre
    35Monitor
  • ← EarlierCVE-2024-36613Jan 3, 2025 · FFmpeg n6.1.1 has a vulnerability in the DXA demuxer of the libavformat library allowing for an integer overflow, potentially resulting in a
    24Monitor
  • Later →CVE-2023-6604Jan 6, 2025 · Ffmpeg: hls xbin demuxer dos amplification in ffmpeg
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
github.com/FFmpeg/FFmpeg FFmpeg6.*Vendor (CNA)
debian:ffmpeg7:6.1-1 · Debian:13Package registry (OSV)
opensuse:ffmpeg-44.4.6-150600.13.38.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:ffmpeg-77.1.3-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:ffmpeg-44.4.6-150600.13.38.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-66050 days apartFfmpeg: dash playlist ssrf vulnerability in ffmpeg
    28Monitor
  • CVE-2023-66040 days apartFfmpeg: hls xbin demuxer dos amplification in ffmpeg
    21Monitor
  • CVE-2023-66026 days apartFfmpeg: improper handling of input format in tty demuxer of ffmpeg
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-99 · Improper Control of Resource Identifiers ('Resource Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records