What is CVE-2023-25435?

CVE-2023-25435 is a medium-severity vulnerability in Libtiff, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2023-06-21.

How severe is CVE-2023-25435?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2023-25435 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Libtiff

CVE-2023-25435

libtiff 4.5.0 is vulnerable to Buffer Overflow via extractContigSamplesShifted8bits() at /libtiff/tools/tiffcrop.c:3753.

Vulnerability class: Buffer Overflow

Published 2023-06-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (25.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Libtiff — versions 4.5.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

13579and2468/Wei-fuzz

References

gitlab.com/libtiff/libtiff/-/issues/518 (Exploit, Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-25435?: CVE-2023-25435 is a medium-severity vulnerability in Libtiff, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2023-06-21.
How severe is CVE-2023-25435?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2023-25435 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.