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Fencer Vulns
high 7.5

CVE-2024-21484 json

Marvin Attack of RSA and RSAOAEP decryption in jsrsasign

published 2024-01-19 2 y ago modified 2026-06-22 4 mo ago also GHSA-rh63-9qcf-83gf , EUVD-2024-0416

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm jsrsasign 11.0.0
  • n/a jsrsasign 11.0.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-21484 updated cvss 7.5

jsrsasign: vulnerable to Observable Discrepancy via the RSA PKCS1.5 or RSAOAEP decryption process

  • Red Hat Quay 3 quay/quay-rhel8
    affected: no fix available
  • Red Hat Migration Toolkit for Virtualization 2.5 migration-toolkit-virtualization/mtv-console-plugin-rhel9 2.5.5-3
    fixed: vendor fix RHBA-2024:0928
  • Red Hat Migration Toolkit for Virtualization 2.5 migration-toolkit-virtualization/mtv-api-rhel9 2.5.5-2, migration-toolkit-virtualization/mtv-rhel8-operator 2.5.5-8, migration-toolkit-virtualization/mtv-virt-v2v-rhel9 2.5.5-2, migration-toolkit-virtualization/mtv-controller-rhel9 2.5.5-2, migration-toolkit-virtualization/mtv-operator-bundle 2.5.5-16, migration-toolkit-virtualization/mtv-validation-rhel9 2.5.5-2, +7 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/kjur/jsrsasign/issues/598 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L/E:P
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L

Affected packages

ecosystem package affected fixed in
npm jsrsasign
<11.0.0
11.0.0

Affected products

  • n/a jsrsasign
  • n/a org.webjars.npm:jsrsasign
  • n/a org.webjars.bowergithub.kjur:jsrsasign
  • n/a org.webjars.bower:jsrsasign

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.