CVE-2018-25012Network attack vector

Memory disclosure and crash via truncated VP8X chunk

Published May 21, 2021 · Updated Aug 5, 2024

Out-of-bounds read in Google libwebp before 1.0.1 allows remote attackers to read process memory or crash applications via crafted WebP files. WebPMuxCreateInternal parses a truncated VP8X chunk and calls GetLE24 at offsets 12 and 15 without first verifying that the chunk contains the full VP8X header. Reachability requires an application to pass attacker-controlled WebP container data to the mux parser; the result is memory disclosure or an application crash.

CVSS severity9.1
Critical
EPSS probability2.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Google libwebp before 1.0.1 allows remote attackers to read process memory or crash applications via crafted WebP files. WebPMuxCreateInternal parses a truncated VP8X chunk and calls GetLE24 at offsets 12 and 15 without first verifying that the chunk contains the full VP8X header. Reachability requires an application to pass attacker-controlled WebP container data to the mux parser; the result is memory disclosure or an application crash.

The record

CVE
CVE-2018-25012
Published
May 21, 2021
Updated
Aug 5, 2024
Vendor
Google
Product
libwebp
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record 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=libwebp 1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google · libwebpversion=libwebp 1.0.1

Published CVSS scores

9.1UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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