CVE-2020-19143: Buffer Overflow in LibTiff v4.0.10 allows attackers to cause a denial of service via the "TIFFVGetField" funti

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MEDIUM 6.5WATCHLISTDOWNGRADEMITIGATE

CVE-2020-19143 is a medium-severity flaw (CVSS 6.5) affecting libtiff, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Overflow in LibTiff v4.0.10 allows attackers to cause a denial of service via the "TIFFVGetField" funtion in the component 'libtiff/tif_dir.c'.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.5% (top 27%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-09-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · simplesystems

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-09 15:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

simplesystems libtiff DOWNGRADE

Affected: 4.0.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.10

1. Check installed version

apt-cache policy libtiff || rpm -q libtiff || libtiff --version

2. No fixed release: DOWNGRADE to a release before 4.0.10 (Debian / Ubuntu)

apt-cache madison libtiff sudo apt install libtiff=<VERSION_BEFORE_4.0.10> sudo apt-mark hold libtiff

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libtiff sudo dnf downgrade libtiff-<VERSION_BEFORE_4.0.10> sudo dnf versionlock add libtiff

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-19143?

libtiff: downgrade or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-19143 being exploited?

CVE-2020-19143 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-19143 affect?

CVE-2020-19143 affects libtiff, debian linux. Severity is medium (CVSS 6.5). Buffer Overflow in LibTiff v4.0.10 allows attackers to cause a denial of service via the "TIFFVGetField" funtion in the component 'libtiff/tif_dir.c'.

How urgent is CVE-2020-19143?

Priority 46/100. On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2026-4775 HIGH 7.8 UPGRADE MITIGATE A flaw was found in the libtiff library
CVE-2023-52355 HIGH 7.5 UPGRADE MITIGATE An out-of-memory flaw was found in libtiff that could be triggered by passing a crafted tiff file to the TIFFR
CVE-2023-30086 MEDIUM 5.5 DOWNGRADE Buffer Overflow vulnerability found in Libtiff V.4.0.7 allows a local attacker to cause a denial of service vi
CVE-2023-3576 MEDIUM 5.5 UPGRADE MITIGATE A memory leak flaw was found in Libtiff's tiffcrop utility
CVE-2025-9165 LOW 2.5 DOWNGRADE A flaw has been found in LibTIFF 4.7.0

References

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