Is CVE-2018-15836 in the CISA KEV catalog?

No. CVE-2018-15836 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-15836?

CVE-2018-15836 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-15836?

CVE-2018-15836 has an EPSS score of 1.49% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-15836?

Upgrade openswan to 2.6.50.1 or later.

CVE & CISA-KEV Catalog

CVE-2018-15836

HIGHEPSS 71th pctl

7.5

CVSS v3

NVD

Description

In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used.

CWE-347

How to fix

Remediation Available

openswanNVD

Affected:< 2.6.50.1Fixed in:2.6.50.1CVE-2018-15836derived from NVD

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

Exploit Intelligence

1.49%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Patch2

Vendor Advisory1

lists.openswan.org

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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 2024-11-21.