CVE-2020-26939 Vulnerability Analysis & Exploit Details

CVE-2020-26939
Vulnerability Scoring

5.3
/10
Significant Risk

Security assessments indicate that CVE-2020-26939 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2020-26939 Details

Status: Modified

Last updated: 🕒 07 Nov 2023, 03:20 UTC
Originally published on: 🕙 02 Nov 2020, 22:15 UTC

Time between publication and last update: 1099 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2020-26939 Vulnerability Summary

CVE-2020-26939: 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.

Assessing the Risk of CVE-2020-26939

Access Complexity Graph

The exploitability of CVE-2020-26939 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2020-26939

With low attack complexity and no required privileges, CVE-2020-26939 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2020-26939, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2020-26939, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2020-26939 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: None
    CVE-2020-26939 poses no threat to data integrity.
  • Availability: None
    CVE-2020-26939 does not impact system availability.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.071% (probability of exploit)

EPSS Percentile: 34.09% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 65.91% of others.

CVE-2020-26939 References

External References

CWE Common Weakness Enumeration

CWE-203

CAPEC Common Attack Pattern Enumeration and Classification

  • Black Box Reverse Engineering CAPEC-189 An adversary discovers the structure, function, and composition of a type of computer software through black box analysis techniques. 'Black Box' methods involve interacting with the software indirectly, in the absence of direct access to the executable object. Such analysis typically involves interacting with the software at the boundaries of where the software interfaces with a larger execution environment, such as input-output vectors, libraries, or APIs. Black Box Reverse Engineering also refers to gathering physical side effects of a hardware device, such as electromagnetic radiation or sounds.

Vulnerable Configurations

  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.00:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.00:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.01:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.01:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.02:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.02:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.03:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.03:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.04:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.04:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.05:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.05:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.06:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.06:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.07:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.07:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.08:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.08:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.09:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.09:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.10:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.10:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.11:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.11:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.12:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.12:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.13:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.13:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.14:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.14:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.15:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.15:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.16:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.16:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.17:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.17:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.18:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.18:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.19:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.19:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.20:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.20:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.21:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.21:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.22:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.22:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.23:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.23:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.24:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.24:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.25:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.25:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.26:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.26:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.27:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.27:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.28:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.28:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.29:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.29:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.30:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.30:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.31:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.31:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.32:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.32:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.33:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.33:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.34:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.34:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.35:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.35:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.36:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.36:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.37:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.37:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.38:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.38:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.39:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.39:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.40:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.40:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.41:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.41:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.42:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.42:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.43:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.43:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.44:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.44:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.45:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.45:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.46:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.46:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.47:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.47:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.48:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.48:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.49:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.49:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.50:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.50:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.51:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.51:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.52:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.52:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.53:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.53:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.54:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.54:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.55:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.55:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.56:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.56:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.57:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.57:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.58:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.58:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.59:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.59:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.60:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:1.60:*:*:*:*:*:*:*
  • cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle-fips-java-api:-:*:*:*:*:*:*:*
    cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle-fips-java-api:-:*:*:*:*:*:*:*

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