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CVE-2021-45079

CRITICALCVSS 9.1/10EPSS 2.76%

Last modified

CVE-2021-45079 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.. EPSS estimates a 2.76% chance of exploitation in the next 30 days.

Description

In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.

Metrics

CVSS 3.1
9.1/10

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

EPSS Probability
2.76%

84.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
StrongswanStrongswan>= 4.1.2, < 5.9.5
DebianDebian Linux9.0
DebianDebian Linux10.0
DebianDebian Linux11.0
FedoraprojectExtra Packages For Enterprise Linux7.0
FedoraprojectExtra Packages For Enterprise Linux8.0
FedoraprojectExtra Packages For Enterprise Linux9.0
FedoraprojectFedora34
FedoraprojectFedora35
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux20.04
CanonicalUbuntu Linux21.10

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-45079?
In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.
How severe is CVE-2021-45079?
CVE-2021-45079 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 2.76% probability of exploitation in the next 30 days.
How do I fix CVE-2021-45079?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-45079?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST