Description
Use-after-free vulnerability in the cryptographic helper handler functionality in Openswan 2.3.0 through 2.6.36 allows remote authenticated users to cause a denial of service (pluto IKE daemon crash) via vectors related to the (1) quick_outI1_continue and (2) quick_outI1 functions.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | openswan | 1:2.6.28+dfsg-5+squeeze1 | DSA-2374-1 |
| Debian 5.0 | openswan | 1:2.4.12+dfsg-1.3+lenny4 | DSA-2374-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | openswan +1 | 2.6.32-4.el6_1.4 | RHSA-2011:1422 |
| RHEL 5 | openswan +1 | 2.6.21-5.el5_7.6 | RHSA-2011:1422 |
Advisories 2
- RHSA-2011:1422 Red Hat Security Advisory: openswan security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2374-1 openswan - implementation error Debian Security (DSA / DLA) · Mar 9, 2026
References
- 47342 third-party-advisory
- 50440 vdb-entry
- DSA-2374 vendor-advisory
- 46678 third-party-advisory
- http://www.openswan.org/download/CVE-2011-4073/CVE-2011-4073.txt
- RHSA-2011:1422 vendor-advisory
- 1026268 vdb-entry
- 46681 third-party-advisory