CVE-2024-21484
Marvin Attack of RSA and RSAOAEP decryption in jsrsasign
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2024-21484- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L/E:P - Weakness
- CWE-203
- Updated
- 2026-11-02
EUVDEUVD-2024-0416
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.
- Record
EUVD-2024-0416- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L/E:P - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rh63-9qcf-83gf
Marvin Attack of RSA and RSAOAEP decryption in jsrsasign
Impact
RSA PKCS#1.5 or RSAOAEP ciphertexts may be decrypted by this Marvin attack vulnerability.
Patches
update to jsrsasign 11.0.0.
Workarounds
Find and replace RSA and RSAOAEP decryption with other crypto library.
References
https://people.redhat.com/~hkario/marvin/ https://github.com/kjur/jsrsasign/issues/598 https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-6070732 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21484
- Record
GHSA-rh63-9qcf-83gf- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L - Weakness
- CWE-203
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2024-21484- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-203
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2024-21484- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L/E:P - Weakness
- CWE-203
- Updated
- 2026-11-02
OSVGHSA-rh63-9qcf-83gf
Marvin Attack of RSA and RSAOAEP decryption in jsrsasign
Impact
RSA PKCS#1.5 or RSAOAEP ciphertexts may be decrypted by this Marvin attack vulnerability.
Patches
update to jsrsasign 11.0.0.
Workarounds
Find and replace RSA and RSAOAEP decryption with other crypto library.
References
https://people.redhat.com/~hkario/marvin/ https://github.com/kjur/jsrsasign/issues/598 https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-6070732 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21484
- Record
GHSA-rh63-9qcf-83gf- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L - Weakness
- CWE-203
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
jsrsasignnpm |
before 11.0.0 | 11.0.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-21484 is a high vulnerability (CVSS 7.5) in Kjur Jsrsasign, published January 19, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 61st percentile. Fixed in jsrsasign 11.0.0.
References
security.snyk.io/vuln/SNYK-JS-JSRSASIGN-6070731
github.com/kjur/jsrsasign/issues/598