CVE-2018-25009Network attack vector

Memory disclosure and crash via unchecked VP8X length

Published May 21, 2021 · Updated Aug 5, 2024

Out-of-bounds read in Google libwebp before 1.0.1 allows remote attackers to disclose memory or crash applications via crafted WebP data. The VP8X parser in src/mux/muxread.c reads canvas dimensions at fixed offsets without first ensuring the chunk contains the required header and payload bytes. Exposure requires an application to pass attacker-controlled WebP container data to the mux parser; the bounded effects are memory disclosure and process crash.

CVSS severity9.1
Critical
EPSS probability2.10%
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 disclose memory or crash applications via crafted WebP data. The VP8X parser in src/mux/muxread.c reads canvas dimensions at fixed offsets without first ensuring the chunk contains the required header and payload bytes. Exposure requires an application to pass attacker-controlled WebP container data to the mux parser; the bounded effects are memory disclosure and process crash.

The record

CVE
CVE-2018-25009
Published
May 21, 2021
Updated
Aug 5, 2024
Vendor
Google
Product
libwebp
Classifications
CWE-125, CAPEC-540
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

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
9.1NIST NVDCVSS: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

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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
CAPEC-540Overread Buffers

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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