CVE-2023-6601Network attack vector

Unintended data disclosure via HLS extension bypass

Published Jan 6, 2025 · Updated Nov 3, 2025

Resource injection in FFmpeg 2.0 through 6.0 allows remote attackers to disclose unintended data through a crafted HLS playlist. The HLS demuxer checks the apparent suffix of a base64 data URI without stripping padding or trailing characters, so an appended extension passes the allowlist and arbitrary payloads reach demuxers. Exploitation requires FFmpeg to auto-detect and process attacker-controlled media; generated output can incorporate data from unintended sources.

CVSS severity4.7
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource injection in FFmpeg 2.0 through 6.0 allows remote attackers to disclose unintended data through a crafted HLS playlist. The HLS demuxer checks the apparent suffix of a base64 data URI without stripping padding or trailing characters, so an appended extension passes the allowlist and arbitrary payloads reach demuxers. Exploitation requires FFmpeg to auto-detect and process attacker-controlled media; generated output can incorporate data from unintended sources.

The record

CVE
CVE-2023-6601
Published
Jan 6, 2025
Updated
Nov 3, 2025
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-99, CWE-94
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0 <6.*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=2.0 <6.*

Published CVSS scores

4.7NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-99Improper Control of Resource Identifiers ('Resource Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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