charon/sa/tasks/child_create.c in the charon daemon in strongSWAN before 4.3.1 switches the NULL checks for TSi and TSr payloads, which all…

published 2009-06-06 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1953

cvss: 5.0; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.9%; EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

charon/sa/tasks/child_create.c in the charon daemon in strongSWAN before 4.3.1 switches the NULL checks for TSi and TSr payloads, which allows remote attackers to cause a denial of service via an IKE_AUTH request without a (1) TSi or (2) TSr traffic selector.

Patch / fix

distros 1 links 2

strongswan Debian 14, Debian 13, Debian 12 4.2.14-1.1

debian advisories DEBIAN-CVE-2009-1958

Exploit prediction

2.95% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-399 Resource Management Errors

References

download.strongswan.org /patches/04_swapped_ts_check_patch/strongswan-4.x.x._swapped_ts_check.readme
patch
download.strongswan.org /patches/04_swapped_ts_check_patch/strongswan-4.x.x._swapped_ts_check.patch
patch
debian.org /security/2009/dsa-1899
vendor-advisory
lists.opensuse.org /opensuse-security-announce/2009-07/msg00002.html
vendor-advisory
download.strongswan.org /CHANGES4.txt
vendor-advisory
secunia.com /advisories/35296
third-party-advisory
secunia.com /advisories/36922
third-party-advisory
lists.strongswan.org /pipermail/users/2009-May/003457.html
mailing-list
securityfocus.com /bid/35178
vdb-entry
secunia.com /advisories/35685
third-party-advisory

Sources

CVE List CVE-2009-1958
NVD CVE-2009-1958

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary