// For flags

CVE-2020-26939

 

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In Legion of the Bouncy Castle BC before 1.61 and BC-FJA before 1.0.1.2, attackers can obtain sensitive information about a private exponent because of Observable Differences in Behavior to Error Inputs. This occurs in org.bouncycastle.crypto.encodings.OAEPEncoding. Sending invalid ciphertext that decrypts to a short payload in the OAEP Decoder could result in the throwing of an early exception, potentially leaking some information about the private exponent of the RSA private key performing the encryption.

En Legion of the Bouncy Castle BC versiones anteriores a 1.61 y BC-FJA versiones anteriores a 1.0.1.2, los atacantes pueden obtener información confidencial sobre un exponente privado debido a las diferencias observables en el comportamiento de las entradas de error. Esto se presenta en org.bouncycastle.crypto.encodings.OAEPEncoding. El envío de texto cifrado no válido que es descifrado en una carga útil corta en el decodificador OAEP podría resultar en el lanzamiento de una excepción temprana, filtrando potencialmente alguna información sobre el exponente privado de la clave privada RSA que realiza el cifrado

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-10-10 CVE Reserved
  • 2020-11-02 CVE Published
  • 2023-11-08 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-203: Observable Discrepancy
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Bouncycastle
Search vendor "Bouncycastle"
 Legion-of-the-bouncy-castle
Search vendor "Bouncycastle" for product "Legion-of-the-bouncy-castle"
 < 1.61
Search vendor "Bouncycastle" for product "Legion-of-the-bouncy-castle" and version " < 1.61"
-
Affected
Bouncycastle
Search vendor "Bouncycastle"
 Legion-of-the-bouncy-castle-fips-java-api
Search vendor "Bouncycastle" for product "Legion-of-the-bouncy-castle-fips-java-api"
 < 1.0.1.2
Search vendor "Bouncycastle" for product "Legion-of-the-bouncy-castle-fips-java-api" and version " < 1.0.1.2"
-
Affected