The pluto IKE daemon in libreswan before 3.15 and Openswan before 2.6.45, when built with…
Priority LOW 25CWE-189Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- Partial Red Hat: 3 fixed, 2 without a fix
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-189 and the CVSS impact.
Summary
The pluto IKE daemon in libreswan before 3.15 and Openswan before 2.6.45, when built with NSS, allows remote attackers to cause a denial of service (assertion failure and daemon restart) via a zero DH g^x value in a KE payload in a IKE packet.
Why it matters now
EPSS 0.02788 86th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 3 fixed, 2 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libreswan:libreswan:3.14:*:*:*:*:*:*:* | 3.14 | Vulnerable | The Libreswan Project |
- cpe:2.3:a:libreswan:libreswan:3.14:*:*:*:*:*:*:* Versions 3.14 Vulnerable ·The Libreswan Project
Remediation
Red Hat 1 advisory
- RHSA-2015:1979 Released 2015-11-04 · Red Hat rating Moderatelibreswan security and enhancement update
- Red Hat Enterprise Linux Client (v. 7) libreswan-3.15-5.el7_1
- Red Hat Enterprise Linux Server (v. 7) libreswan-3.15-5.ael7b_1, libreswan-3.15-5.el7_1
- Red Hat Enterprise Linux Workstation (v. 7) libreswan-3.15-5.el7_1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2015:1979 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2015:1979 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2015:1979 |
Timeline
- 2026-10-02 Threatist record created from CVE-2015-3240
- 2026-10-03 Alias added: GHSA-m56r-f6p2-qgw5
References
More The Libreswan Project Libreswan vulnerabilities
- TI-2023-09114 Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and… CVSS 3.1MEDIUM 6.5
- TI-2013-05949 Race condition in the libreswan.spec files for Red Hat Enterprise Linux (RHEL) and Fedora… CVSS 2.0HIGH 9.3
- TI-2023-02152 Uncontrolled resource consumption in libreswan CVSS 3.1HIGH 7.5
- TI-2026-37395 IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload CVSS 3.1HIGH 8.1
- TI-2026-37394 IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload CVSS 3.1HIGH 8.1
- TI-2023-14401 pluto in Libreswan before 4.11 allows a denial of service (responder SPI mishandling and… CVSS 3.1HIGH 7.5
Sources
- CVE-2015-3240 · CVE Program
- CVE-2015-3240 · NVD
- FIRST EPSS
- GHSA-m56r-f6p2-qgw5 · GitHub Advisory Database · CC BY 4.0
- CVE-2015-3240 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences