CVE-2017-9815 — In LibTIFF 4

In LibTIFF 4.0.7, the TIFFReadDirEntryLong8Array function in libtiff/tif_dirread.c mishandles a malloc operation, which allows attackers to cause a denial of service (memory leak within the function _TIFFmalloc in tif_unix.c) via a crafted file.

01What is this vulnerability?

In LibTIFF 4.0.7, the TIFFReadDirEntryLong8Array function in libtiff/tif_dirread.c mishandles a malloc operation, which allows attackers to cause a denial of service (memory leak within the function _TIFFmalloc in tif_unix.c) via a crafted file.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-06-22T15:29:00.173
• Last modified: 2026-05-13T00:24:29.033

09References

• bugzilla.maptools.org — http://bugzilla.maptools.org/show_bug.cgi?id=2682
• somevulnsofadlab.blogspot.jp — http://somevulnsofadlab.blogspot.jp/2017/06/libtiffmemory-leak-in-tiffmalloc.htm…
• www.securityfocus.com — http://www.securityfocus.com/bid/99235
• usn.ubuntu.com — https://usn.ubuntu.com/3602-1/
• bugzilla.maptools.org — http://bugzilla.maptools.org/show_bug.cgi?id=2682
• somevulnsofadlab.blogspot.jp — http://somevulnsofadlab.blogspot.jp/2017/06/libtiffmemory-leak-in-tiffmalloc.htm…
• www.securityfocus.com — http://www.securityfocus.com/bid/99235
• usn.ubuntu.com — https://usn.ubuntu.com/3602-1/