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Vulnerabilities / CVE-2019-17455

critical

CVE-2019-17455

libntlm: stack-based buffer overflow in buildSmbNtlmAuthRequest in smbutil.c

Published Modified CWE 125
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD, CBL-Mariner. Rated lower by Red Hat (medium), Ubuntu (medium).

Description

Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.

Affected packages and fixed versions

SourcePackageFixed in
CBL-Mariner 2.0libntlm0:1.6-1.cm2
debian 10libntlm1.5-1+deb10u1
debian 11libntlm1.6-1
debian 12libntlm1.6-1
debian 13libntlm1.6-1
debian 14libntlm1.6-1
debian 8libntlm1.4-3+deb8u1
debian 9libntlm1.4-8+deb9u1
echolibntlm1.6-1
Red Hatlibntlm, libntlm-develno fix listed
ubuntu 14.04-ESMlibntlm1.4-1ubuntu0.1~esm1
ubuntu 16.04-ESMlibntlm1.4-7ubuntu0.1~esm1
Show all 17 entries from 16 sources
SourcePackageFixed in
CBL-Mariner 2.0libntlm0:1.6-1.cm2
debian 10libntlm1.5-1+deb10u1
debian 11libntlm1.6-1
debian 12libntlm1.6-1
debian 13libntlm1.6-1
debian 14libntlm1.6-1
debian 8libntlm1.4-3+deb8u1
debian 9libntlm1.4-8+deb9u1
echolibntlm1.6-1
Red Hatlibntlmno fix listed
Red Hatlibntlm-develno fix listed
ubuntu 14.04-ESMlibntlm1.4-1ubuntu0.1~esm1
ubuntu 16.04-ESMlibntlm1.4-7ubuntu0.1~esm1
ubuntu 18.04libntlm1.4-8ubuntu0.1
ubuntu 18.04-ESMlibntlm1.4-8ubuntu0.1
ubuntu 20.04libntlm1.5-2ubuntu0.1
ubuntu 20.04-ESMlibntlm1.5-2ubuntu0.1

References

All 15 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.