CVE-2025-8177Public exploit

Out-of-bounds read via unchecked colormap index

Published Jul 26, 2025 · Updated Jul 28, 2025

Buffer overflow in LibTIFF 4.0 through 4.7.0 allows local users to read beyond memory by processing a malformed TIFF with thumbnail. In tools/thumbnail.c, setrow uses malformed-image-derived pixel data to index the 256-byte cmap array without keeping the index in bounds. The flaw is reached when the thumbnail command processes a crafted local file; the published proof demonstrates an out-of-bounds read and process abort, not code execution.

CVSS severity4.8
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in LibTIFF 4.0 through 4.7.0 allows local users to read beyond memory by processing a malformed TIFF with thumbnail. In tools/thumbnail.c, setrow uses malformed-image-derived pixel data to index the 256-byte cmap array without keeping the index in bounds. The flaw is reached when the thumbnail command processes a crafted local file; the published proof demonstrates an out-of-bounds read and process abort, not code execution.

The record

CVE
CVE-2025-8177
Published
Jul 26, 2025
Updated
Jul 28, 2025
Vendor
LibTIFF
Product
LibTIFF
Classifications
CWE-120, CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=4.0
  2. Affected versionversion=4.1
  3. Affected versionversion=4.2
  4. Affected versionversion=4.3
  5. Affected versionversion=4.4
  6. Affected versionversion=4.5
  7. Affected versionversion=4.6
  8. Affected versionversion=4.7.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

LibTIFF · LibTIFFversion=4.0; version=4.1; version=4.2; version=4.3; version=4.4; version=4.5; version=4.6; version=4.7.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.8VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

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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