Is CVE-2018-16151 in the CISA KEV catalog?

No. CVE-2018-16151 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-16151?

CVE-2018-16151 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-16151?

CVE-2018-16151 has an EPSS score of 1.89% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-16151?

Upgrade strongswan on debian 11 to 5.7.0-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2018-16151

HIGHEPSS 77th pctl

7.5

CVSS v3

NVD

Description

In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.

CWE-347

How to fix

Remediation Available

strongswanDebian

Fixed in:5.7.0-1CVE-2018-16151

libstrongswanUbuntu

Fixed in:5.1.2-0ubuntu2.10USN-3771-1

Fixed in:5.3.5-1ubuntu3.7USN-3771-1

Fixed in:5.6.2-1ubuntu2.2USN-3771-1

strongswanUbuntu

Fixed in:5.1.2-0ubuntu2.10USN-3771-1

Fixed in:5.3.5-1ubuntu3.7USN-3771-1

Fixed in:5.6.2-1ubuntu2.2USN-3771-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

1.89%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Third-Party Advisory4

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-03.