CVE-2019-6991

CRITICAL

A classic Stack-based buffer overflow exists in the zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through 1.32.3, allowing an unauthenticated attacker to execute code via a l...

Affects 1 product across 1 vendor.

CVSS 3.09.8
EPSS3.3%
Percentile88th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-787: Out-of-Bounds Write

Software writes data past buffer boundaries, corrupting memory and potentially enabling code execution.

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2019. A critical vulnerability affects Zoneminder systems (CVE-2019-6991). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2019-GLOBAL-213614-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2019-6991?
This vulnerability was disclosed in 2019. A critical vulnerability affects Zoneminder systems (CVE-2019-6991). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2019-6991?
CVE-2019-6991 has CVSS 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 3.3%.
Is CVE-2019-6991 actively exploited?
No confirmed active exploitation of CVE-2019-6991 as of 2026-05-30.
How do I remediate CVE-2019-6991?
Priority: MEDIUM.
What systems are affected by CVE-2019-6991?
CVE-2019-6991 affects Zoneminder Zoneminder.
Vulnerability Details
CVE IDCVE-2019-6991
BSIDBS-2019-GLOBAL-213614-C BreachSpider Global ID
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2019-01-28
Last Modified2024-11-21
ICS Relevance15%
Weakness (CWE)
Out-of-Bounds Write
SourceNVD
Official Description

A classic Stack-based buffer overflow exists in the zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through 1.32.3, allowing an unauthenticated attacker to execute code via a long username.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: A classic Stack-based buffer overflow exists in the zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through 1.32.3, allowing an unauthenticated attacker to execute code via a long username. CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation Likelihood: LOW

Affected Products
VendorProductAffected Versions
Zoneminder Zoneminder ≤ 1.32.3
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 2817 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hashe35f45bec0a42077e6b1290a8b3692145f2d0b4c6e2ec0957bb5cad78a2e22885728f8e15581ed6421b78034a2e11eb114ff31ea5654e5445cbdc8f6db1fc040
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