The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets which are encrypted and integrity
The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets which are encrypted and integrity protected using the established IKE SA encryption and integrity keys, but as a receiver, the integrity check value was not verified. This issue affects versions before 3.29.
- Published
- Jun 12, 2019
- Updated
- Jun 16, 2026
- EPSS
- 0.5% · 41th percentile
- CWE
- CWE-354
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Report tools
Action score
12
Monitor
Low priority for now.
- CVSS
- 12 / 40 · 3.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CNA vs NVD score
- NVD
- 3.1
- CNA · redhat
- 3.1
- agree
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| libreswan | libreswan | cpe:2.3:a:libreswan:libreswan |
| strongswan | strongswan | cpe:2.3:a:strongswan:strongswan |
| xelerance | openswan | cpe:2.3:a:xelerance:openswan |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora29
- fedoraproject fedora30
- libreswan libreswanbefore 3.29
- redhat enterprise linux8.0
- strongswan strongswanbefore 5.0.0
- xelerance openswanall versions
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
the libreswan Project libreswan
- 3.29affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | libreswan | before 3.27-6 | 3.27-6 |
| Debian:12 | strongswan | before 5.1.0-1 | 5.1.0-1 |
| Red Hat:enterprise_linux:8::appstream | libreswan | before 0:3.29-6.el8 | 0:3.29-6.el8 |
| Red Hat:enterprise_linux:8::appstream | libreswan-debuginfo | before 0:3.29-6.el8 | 0:3.29-6.el8 |
| Red Hat:enterprise_linux:8::appstream | libreswan-debugsource | before 0:3.29-6.el8 | 0:3.29-6.el8 |
Same product
libreswan: all recordsOther highest-scoring records for the same primary product.
- CVE-2013-7283Race condition in the libreswan.spec files for Red Hat Enterprise Linux (RHEL) and Fedora packages in libreswan 3.6 has unspecified impact a37Monitor
- CVE-2022-23094Libreswan 4.2 through 4.5 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted IKE31Monitor
- CVE-2020-1763An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an unauthenticated attacker31Monitor
- CVE-2019-12312In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart.31Monitor
- CVE-2016-5391libreswan before 3.18 allows remote attackers to cause a denial of service (NULL pointer dereference and pluto daemon restart).31Monitor
- CVE-2016-5361programs/pluto/ikev1.c in libreswan before 3.17 retransmits in initial-responder states, which allows remote attackers to cause a denial of 31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:libreswan | 3.27-6 · Debian:12 | Package registry (OSV) |
| debian:strongswan | 5.1.0-1 · Debian:12 | Package registry (OSV) |
| red hat:libreswan | 0:3.29-6.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:libreswan-debuginfo | 0:3.29-6.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:libreswan-debugsource | 0:3.29-6.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-354 · Improper Validation of Integrity Check ValueCVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2019:3391
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10155
- libreswan.org/security/CVE-2019-10155/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUEXFCN7FAYBKJBQJLYCEUQUCHDEJRZW/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LFGPGLLKAXSLWFI62A6BZHTZSCHRCBXS/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.