CVE-2025-13670

Privilege escalation via planted dynamic library

Published Dec 12, 2025 · Updated Dec 12, 2025

DLL planting in Altera High Level Synthesis Compiler 19.1 through 24.3 allows local users to execute code through the Windows compiler command. The affected command loads a planted DLL from C:\quartus\bin64 when that directory is writable by a nonadministrator. Exploitation requires low-privileged local access and active execution of the affected command, after which attacker-controlled code runs in that process.

CVSS severity5.4
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL planting in Altera High Level Synthesis Compiler 19.1 through 24.3 allows local users to execute code through the Windows compiler command. The affected command loads a planted DLL from C:\quartus\bin64 when that directory is writable by a nonadministrator. Exploitation requires low-privileged local access and active execution of the affected command, after which attacker-controlled code runs in that process.

The record

CVE
CVE-2025-13670
Published
Dec 12, 2025
Updated
Dec 12, 2025
Vendor
Altera
Product
High Level Synthesis Compiler
Classifications
CWE-427, CAPEC-471, T1574.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=19.1 <=24.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Altera · High Level Synthesis Compilerversion=19.1 <=24.3

Published CVSS scores

5.4AlteraCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
6.7AlteraCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
CAPEC-471Search Order Hijacking
T1574.001Hijack Execution Flow: DLL

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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