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CVE-2024-21484

Kjur Jsrsasign vulnerability

7.5 HIGHPublic exploitEPSS 0.96%
  1. Published22 Jan 2024

Description

Versions of the package jsrsasign before 11.0.0 are vulnerable to Observable Discrepancy via the RSA PKCS1.5 or RSAOAEP decryption process. An attacker can decrypt ciphertexts by exploiting the Marvin security flaw. Exploiting this vulnerability requires the attacker to have access to a large number of ciphertexts encrypted with the same key. Workaround The vulnerability can be mitigated by finding and replacing RSA and RSAOAEP decryption with another crypto library.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L

Affected products

Kjur Jsrsasign< 11.0.0

Remediation

Fixed in
Kjur Jsrsasign≥ 11.0.0

References

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Frequently asked

Is CVE-2024-21484 being actively exploited?

CVE-2024-21484 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.96%.

How severe is CVE-2024-21484?

CVE-2024-21484 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.96% probability of exploitation.

Which products are affected by CVE-2024-21484?

Affected products include Kjur Jsrsasign.

How do I fix CVE-2024-21484?

Upgrade affected software to a fixed version, for example Kjur Jsrsasign 11.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-21484 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.