CVE-2013-5018
The is_asn1 function in strongSwan 4.1.11 through 5.0.4 does not properly validate the return value of the asn1_length function, which allows remote attackers to cause a denial of service (segmentation fault) via a (1) XAuth username, (2) EAP identity,…
Does this matter?
Lower severity and a low EPSS score (2.99%). Track it; it rarely justifies an emergency change on its own.
Description
The is_asn1 function in strongSwan 4.1.11 through 5.0.4 does not properly validate the return value of the asn1_length function, which allows remote attackers to cause a denial of service (segmentation fault) via a (1) XAuth username, (2) EAP identity, or (3) PEM encoded file that starts with a 0x04, 0x30, or 0x31 character followed by an ASN.1 length value that triggers an integer overflow.
- CVSS 2.0
- 4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:N/A:P
- EPSS
- 2.99% probability · 87th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- strongswan/strongswan · opensuse/opensuse
- Source
- cve@mitre.org
EPSS 3.0% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00021.html
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00022.html
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00050.html
- http://secunia.com/advisories/54315Vendor Advisory
- http://secunia.com/advisories/54524Vendor Advisory
- http://strongswan.org/blog/2013/08/01/strongswan-5.1.0-released.htmlVendor Advisory
- http://strongswan.org/blog/2013/08/01/strongswan-denial-of-service-vulnerability-%28cve-2013-5018%29.htmlVendor Advisory
- http://www.securityfocus.com/bid/61564
- https://lists.strongswan.org/pipermail/users/2013-July/009540.htmlExploit
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00021.html
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00022.html
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00050.html
- http://secunia.com/advisories/54315Vendor Advisory
- http://secunia.com/advisories/54524Vendor Advisory
- http://strongswan.org/blog/2013/08/01/strongswan-5.1.0-released.htmlVendor Advisory
- http://strongswan.org/blog/2013/08/01/strongswan-denial-of-service-vulnerability-%28cve-2013-5018%29.htmlVendor Advisory
- http://www.securityfocus.com/bid/61564
- https://lists.strongswan.org/pipermail/users/2013-July/009540.htmlExploit
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.