Wowza Streaming Engine 4.5.0 Local Privilege Escalation via nssm_x64.exe
Published Mar 15, 2026
8.5
HIGHCVSS 4.0
EPSS 0.21%
Description
Wowza Streaming Engine 4.5.0 contains a local privilege escalation vulnerability that allows authenticated users to escalate privileges by replacing executable files due to improper file permissions granting full access to the Everyone group. Attackers can replace the nssm_x64.exe binary in the manager and engine service directories with malicious executables to execute code with LocalSystem privileges when services restart.
Affected products
-
- Version 4.5.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Wowza Media Systems, LLC. | Wowza Streaming Engine | n/a |
|
- 4.5.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Mar 16, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Mar–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.21% (0.00208) | 9.86th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.21% (0.00208) | 10.90th | v5 (v2026.06.15) |
| Mar 16, 2026 | 0.01% (0.00009) | 0.89th | v4 (v2025.03.14) |
References (3)
- http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5339.php vendor-advisoryExploitThird Party Advisory
- https://www.exploit-db.com/exploits/40132 exploitThird Party AdvisoryVDB Entry
- https://www.vulncheck.com/advisories/wowza-streaming-engine-local-privilege-escalation-via-nssm-x64-exe third-party-advisoryThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5339.php | vendor-advisoryExploitThird Party Advisory | |
| https://www.exploit-db.com/exploits/40132 | exploitThird Party AdvisoryVDB Entry | |
| https://www.vulncheck.com/advisories/wowza-streaming-engine-local-privilege-escalation-via-nssm-x64-exe | third-party-advisoryThird Party Advisory |
Change history (0)
No recorded changes yet.