What is the CVSS score of CVE-2020-26939?

CVE-2020-26939 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.9%.

Is there a patch available for CVE-2020-26939?

Yes, a patch is available for CVE-2020-26939. Update the affected software to the latest version immediately.

Fips Java Api CVE-2020-26939

MEDIUM

Observable Discrepancy (CWE-203)

2020-11-02 cve@mitre.org

Information Disclosure Fips Java Api Legion Of The Bouncy Castle

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

CVE Published

Nov 02, 2020 - 22:15 nvd

MEDIUM 5.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

74 maven packages depend on org.bouncycastle:bc-fips (20 direct, 55 indirect)
81 maven packages depend on org.bouncycastle:bcprov-ext-jdk15on (14 direct, 68 indirect)
6 maven packages depend on org.bouncycastle:bcprov-jdk14 (5 direct, 1 indirect)
2,361 maven packages depend on org.bouncycastle:bcprov-jdk15on (202 direct, 2,164 indirect)

Ecosystem-wide dependent count for version 1.0.2 and other introduced versions.

DescriptionNVD

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.

AnalysisAI

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. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Technical ContextAI

This vulnerability is classified under CWE-203. 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. Affected products include: Bouncycastle Fips Java Api, Bouncycastle Legion-Of-The-Bouncy-Castle. Version information: before 1.61.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.