How severe is CVE-2013-5018?

CVE-2013-5018 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-5018 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-5018?

CVE-2013-5018 primarily affects Strongswan. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-5018?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-5018 published?

CVE-2013-5018 was published on 2013-08-28 and last updated on 2026-06-16.

CVE-2013-5018

CVE-2013-5018 is a medium-severity vulnerability in Strongswan with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Strongswan
Published: 2013-08-28
Last modified: 2026-06-16

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.

Frequently asked questions

What is 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, 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.
How severe is CVE-2013-5018?: CVE-2013-5018 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-5018 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-5018?: CVE-2013-5018 primarily affects Strongswan. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-5018?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-5018 published?: CVE-2013-5018 was published on 2013-08-28 and last updated on 2026-06-16.

References

Affected products (9)

cpe:2.3:a:strongswan:strongswan:4.1.11:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:5.0.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:5.0.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:5.0.3:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:5.0.4:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*

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