CVE-2019-10155: The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets whic

Q: How do I fix CVE-2019-10155?

libreswan: upgrade to 3.29; strongswan: upgrade to 5.0.0; openswan: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2019-10155 being exploited?

CVE-2019-10155 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-10155 affect?

CVE-2019-10155 affects libreswan, strongswan, openswan. Severity is low (CVSS 3.1). 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 integri

Q: How urgent is CVE-2019-10155?

Priority 27/100. On your watchlist

Routine

LOW 3.1WATCHLISTUPGRADEUPGRADEMITIGATE

CVE-2019-10155 is a low-severity flaw (CVSS 3.1) affecting libreswan, strongswan, openswan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-354
Published	2019-06-12
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: fedoraproject · libreswan · redhat · strongswan · xelerance

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-06-12 14:29 UTCPublished CVE record published
2026-06-17 02:10 UTCUpdated Record last modified

libreswan libreswan UPGRADE

Affected: < 3.29

Fixed in: 3.29

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libreswan || rpm -q libreswan || libreswan --version

2. UPGRADE to 3.29 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libreswan

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libreswan

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

strongswan strongswan UPGRADE

Affected: < 5.0.0

Fixed in: 5.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy strongswan || rpm -q strongswan || strongswan --version

2. UPGRADE to 5.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade strongswan

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade strongswan

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

xelerance openswan MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openswan || rpm -q openswan || openswan --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

fedoraproject fedora MITIGATE

Affected: 29 · 30

Fixed in: no fixed release known

Safe to downgrade to: a release before 29

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-10155?

libreswan: upgrade to 3.29; strongswan: upgrade to 5.0.0; openswan: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-10155 being exploited?

CVE-2019-10155 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-10155 affect?

CVE-2019-10155 affects libreswan, strongswan, openswan. Severity is low (CVSS 3.1). 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 integri

How urgent is CVE-2019-10155?

Priority 27/100. On your watchlist

Software pages

strongSwan vulnerabilities

Related CVEs

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CVE-2026-50721 HIGH 8.1 UPGRADE Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of
CVE-2026-50722 HIGH 8.1 UPGRADE Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER
CVE-2024-3652 MEDIUM 6.5 UPGRADE The Libreswan Project was notified of an issue causing libreswan to restart when using IKEv1 without specifyin
CVE-2023-38712 MEDIUM 6.5 UPGRADE An issue was discovered in Libreswan 3.x and 4.x before 4.12

References

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