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CVE-2020-18768

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which...

5.5 MediumFix available

CVE-2020-18768 is a medium vulnerability (CVSS 5.5) in Libtiff, published October 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in tiff 4.0.10+git190814-1.

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.28%Up 0.2 points since Aug 23, 2023
90%50%10%1%

What each source reports

NVD Score used 5.5

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
CVE-2020-18768
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-787
Updated
2026-11-02
CVE List No score

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
CVE-2020-18768
Updated
2026-11-02
EUVDEUVD-2020-10685 No score

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
EUVD-2020-10685
Updated
2026-11-03
GitHub AdvisoriesGHSA-mqcp-f5vw-2vmj 5.5

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which...

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
GHSA-mqcp-f5vw-2vmj
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-787
Updated
2026-11-02
OSVAZL-43876 5.5

CVE-2020-18768 affecting package openjpeg2 2.3.1-12

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
AZL-43876
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVAZL-44271 5.5

CVE-2020-18768 affecting package openjpeg2 2.3.1-12

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
AZL-44271
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 6 moreShow less
OSV 5.5

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
CVE-2020-18768
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2020-18768 5.5

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
DEBIAN-CVE-2020-18768
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVJLSEC-2025-309 5.5

There exists one heap buffer overflow in `_TIFFmemcpy` in `tif_unix.c` in libtiff 4.0.10, which...

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
JLSEC-2025-309
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-18768 5.5

There exists one heap buffer overflow in _TIFFmemcpy in tif_unix.c in libtiff 4.0.10, which allows an attacker to cause a denial-of-service through a crafted tiff file.

Record
UBUNTU-CVE-2020-18768
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVSUSE-SU-2023:4370-1 No score

Security update for tiff

This update for tiff fixes the following issues:

  • CVE-2023-38289: Fixed a NULL pointer dereference in raw2tiff (bsc#1213589).
  • CVE-2023-38288: Fixed an integer overflow in raw2tiff (bsc#1213590).
  • CVE-2023-3576: Fixed a memory leak in tiffcrop (bsc#1213273).
  • CVE-2020-18768: Fixed an out of bounds read in tiffcp (bsc#1214574).
  • CVE-2023-26966: Fixed an out of bounds read when transforming a little-endian file to a big-endian output (bsc#1212881)
  • CVE-2023-3618: Fixed a NULL pointer dereference while encoding FAX3 files (bsc#1213274).
  • CVE-2023-2908: Fixed an undefined behavior issue when doing pointer arithmetic on a NULL pointer (bsc#1212888).
  • CVE-2023-3316: Fixed a NULL pointer dereference while opening a file in an inaccessible path (bsc#1212535).
  • CVE-2023-25433: Fixed a buffer overflow in tiffcrop (bsc#1212883).
Record
SUSE-SU-2023:4370-1
Updated
2026-11-02
OSVSUSE-SU-2023:4371-1 No score

Security update for tiff

This update for tiff fixes the following issues:

  • CVE-2023-38289: Fixed a NULL pointer dereference in raw2tiff (bsc#1213589).
  • CVE-2023-38288: Fixed an integer overflow in raw2tiff (bsc#1213590).
  • CVE-2023-3576: Fixed a memory leak in tiffcrop (bsc#1213273).
  • CVE-2020-18768: Fixed an out of bounds read in tiffcp (bsc#1214574).
  • CVE-2023-26966: Fixed an out of bounds read when transforming a little-endian file to a big-endian output (bsc#1212881)
  • CVE-2023-3618: Fixed a NULL pointer dereference while encoding FAX3 files (bsc#1213274).
  • CVE-2023-2908: Fixed an undefined behavior issue when doing pointer arithmetic on a NULL pointer (bsc#1212888).
  • CVE-2023-3316: Fixed a NULL pointer dereference while opening a file in an inaccessible path (bsc#1212535).
  • CVE-2023-25433: Fixed a buffer overflow in tiffcrop (bsc#1212883).
Record
SUSE-SU-2023:4371-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openjpeg2
Azure Linux:2
 through 2.3.1-12 None known
openjpeg2
Azure Linux:3
 through 2.3.1-12 None known
tiff
Debian:12
 before 4.0.10+git190814-1
4.0.10+git190814-1
tiff
Debian:13
 before 4.0.10+git190814-1
4.0.10+git190814-1
tiff
Debian:14
 before 4.0.10+git190814-1
4.0.10+git190814-1
tiff
Debian:9
 before 4.0.8-2+deb9u7, plus listed versions
4.0.8-24.0.8-2+deb9u14.0.8-2+deb9u24.0.8-2+deb9u34.0.8-2+deb9u44.0.8-2+deb9u54.0.8-2+deb9u6
4.0.8-2+deb9u7
Libtiff_jll
Julia
 before 4.1.0+0
4.1.0+0
tiff
SUSE:Linux Enterprise Micro 5.3
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
SUSE:Linux Enterprise Micro 5.4
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
SUSE:Linux Enterprise Micro 5.5
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
Show 12 moreShow less
Affected packages
PackageAffectedFixed
tiff
SUSE:Linux Enterprise Module for Basesystem 15 SP4
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
SUSE:Linux Enterprise Module for Basesystem 15 SP5
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
SUSE:Linux Enterprise Module for Package Hub 15 SP4
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
SUSE:Linux Enterprise Module for Package Hub 15 SP5
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
SUSE:Linux Enterprise Micro 5.2
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
openSUSE:Leap Micro 5.3
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
openSUSE:Leap Micro 5.4
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
openSUSE:Leap 15.4
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
openSUSE:Leap 15.5
 before 4.0.9-150000.45.32.1
4.0.9-150000.45.32.1
tiff
SUSE:Linux Enterprise Software Development Kit 12 SP5
 before 4.0.9-44.71.1
4.0.9-44.71.1
tiff
SUSE:Linux Enterprise Server 12 SP5
 before 4.0.9-44.71.1
4.0.9-44.71.1
tiff
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
 before 4.0.9-44.71.1
4.0.9-44.71.1

History

History
WhenChangedSources
2026-11-03affected
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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