CVE-2018-25014Network attack vector

Unspecified impact via uninitialized ReadSymbol value

Published May 21, 2021 · Updated Aug 5, 2024

Use of an uninitialized value in Google libwebp before 1.0.1 allows remote attackers to cause unspecified impact via a crafted WebP image. The ReadSymbol function uses an uninitialized value while decoding lossless WebP Huffman symbols; upstream material does not disclose which value or path leaves it unset. Processing an attacker-controlled WebP image is required, and public records do not identify a reproducible crash, disclosure, or code-execution consequence.

CVSS severity9.8
Critical
EPSS probability2.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized value in Google libwebp before 1.0.1 allows remote attackers to cause unspecified impact via a crafted WebP image. The ReadSymbol function uses an uninitialized value while decoding lossless WebP Huffman symbols; upstream material does not disclose which value or path leaves it unset. Processing an attacker-controlled WebP image is required, and public records do not identify a reproducible crash, disclosure, or code-execution consequence.

The record

CVE
CVE-2018-25014
Published
May 21, 2021
Updated
Aug 5, 2024
Vendor
Google
Product
libwebp
Classifications
CWE-908
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

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-908Use of Uninitialized Resource

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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