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Vulnerability details: VCID-5p1s-8spz-juh2
Vulnerability ID VCID-5p1s-8spz-juh2
Aliases CVE-2020-26939
GHSA-72m5-fvvv-55m6
Summary Observable Differences in Behavior to Error Inputs in Bouncy Castle In Legion of the Bouncy Castle BC before 1.55 and BC-FJA before 1.0.2, 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-203 Observable Discrepancy
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.00761 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
epss 0.02351 https://api.first.org/data/v1/epss?cve=CVE-2020-26939
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-72m5-fvvv-55m6
cvssv3.1 5.3 https://github.com/bcgit/bc-java/commit/930f8b274c4f1f3a46e68b5441f1e7fadb57e8c1
generic_textual MODERATE https://github.com/bcgit/bc-java/commit/930f8b274c4f1f3a46e68b5441f1e7fadb57e8c1
cvssv3.1 5.3 https://github.com/bcgit/bc-java/wiki/CVE-2020-26939
generic_textual MODERATE https://github.com/bcgit/bc-java/wiki/CVE-2020-26939
cvssv3.1 5.3 https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e@%3Cissues.solr.apache.org%3E
generic_textual MODERATE https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e@%3Cissues.solr.apache.org%3E
cvssv3.1 5.3 https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e%40%3Cissues.solr.apache.org%3E
generic_textual MODERATE https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e%40%3Cissues.solr.apache.org%3E
cvssv3.1 5.3 https://lists.debian.org/debian-lts-announce/2020/11/msg00007.html
generic_textual MODERATE https://lists.debian.org/debian-lts-announce/2020/11/msg00007.html
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-26939
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2020-26939
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-26939
cvssv3.1 5.3 https://security.netapp.com/advisory/ntap-20201202-0005
generic_textual MODERATE https://security.netapp.com/advisory/ntap-20201202-0005
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-26939
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26939
https://github.com/bcgit/bc-java/commit/930f8b274c4f1f3a46e68b5441f1e7fadb57e8c1
https://github.com/bcgit/bc-java/wiki/CVE-2020-26939
https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e@%3Cissues.solr.apache.org%3E
https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e%40%3Cissues.solr.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/11/msg00007.html
https://nvd.nist.gov/vuln/detail/CVE-2020-26939
https://security.netapp.com/advisory/ntap-20201202-0005
cpe:2.3:a:bouncycastle:fips_java_api:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:bouncycastle:fips_java_api:*:*:*:*:*:*:*:*
cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:bouncycastle:legion-of-the-bouncy-castle:*:*:*:*:*:*:*:*
GHSA-72m5-fvvv-55m6 https://github.com/advisories/GHSA-72m5-fvvv-55m6
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/bcgit/bc-java/commit/930f8b274c4f1f3a46e68b5441f1e7fadb57e8c1
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/bcgit/bc-java/wiki/CVE-2020-26939
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e@%3Cissues.solr.apache.org%3E
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e%40%3Cissues.solr.apache.org%3E
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://lists.debian.org/debian-lts-announce/2020/11/msg00007.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26939
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26939
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://security.netapp.com/advisory/ntap-20201202-0005
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.72374
EPSS Score 0.00761
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:49:06.998105+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-72m5-fvvv-55m6/GHSA-72m5-fvvv-55m6.json 37.0.0