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CVE
CVE-2020-2805216
An issue was discovered in Legion of the Bouncy Castle BC Java 1.65 and 1.66. The OpenBSDBCrypt.checkPassword utility me
An issue was discovered in Legion of the Bouncy Castle BC Java 1.65 and 1.66. The OpenBSDBCrypt.checkPassword utility method compared incorrect data when checking the password, allowing incorrect passwords to indicate they were matching with previously hashed ones that were different.
HIGH · CVSS 8.1
EPSS 0.0714
EPSS exploitation odds7.14% · top 6%
Act now
- EPSS percentile: top 6% of all CVEs by exploitation likelihood
- Public exploit or PoC is available
- CVSS base score ≥ 7.0
No Sigma yet — build one →
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2020-28052, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
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Exploitation evidence
1 of 7 sources
Corroboration score 8/100 ·
emerging.
This counts how many independent sources have exploitation evidence, and separates two different things:
confirmed in-the-wild use (CISA KEV, Microsoft MSRC, ransomware activity) from
exploit / PoC availability (Metasploit, ExploitDB, Nuclei, public PoCs). A template or PoC existing means
an attack is possible and easy - it is not, on its own, proof the CVE is being exploited in the wild.
Exploit / PoC available
public PoC
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Exploitation momentum
991 days of EPSSstable
Exploitation pressure is steady. This reads the direction and speed of EPSS over time, which can move before EPSS itself peaks or before CISA lists it.
EPSS exploitation probability
7.14%
Top 6%odds of exploitation in the next 30 days
CVSS metric silhouette
shape grows toward worst-case
SSVC triage
No SSVC vulnrichment for this CVE. CISA's Vulnrichment program scores newer CVEs (~2024 onwards) plus selected older critical ones. Use the EPSS probability + KEV status to triage instead.
CVSS vector breakdown
Exploitability - how they get in
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Impact - what breaks
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
VECTOR
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HLifecycle
- 18 Dec 2020Published to NVD
- 17 Jun 2026Last modified
Every entry is a recorded date - NVD publish/modify, CISA KEV add, public exploit disclosure. No inferred events.
Attack path
Full kill chain
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Public Exploits & PoCs
16These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted. Signed-in users mark whether it works, rate 1-10, and can report malware with a required reason that becomes a public comment.
Source
Works?
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ATT&CK techniques
1Techniques this CVE enables. Pills with a solid outline are high confidence - named directly in ATT&CK or Nuclei, or human-curated by CTID; the rest are inferred from the weakness type using MITRE's CVE Mapping Methodology and the CWE → CAPEC chain. Broad, generic-weakness guesses are filtered out. A small N× marks a technique that N independent sources agree on.
▤ Build a SIEM detection for these techniques▤
Affected Products & Versions
20bouncycastle bc-javaall versions
apache karafall versions
oracle banking extensibility workbenchall versions
oracle banking supply chain financeall versions
oracle banking virtual account managementall versions
oracle blockchain platform< 21.1.2
oracle commerce guided searchall versions
oracle communications convergenceall versions
oracle communications pricing design centerall versions
oracle communications session report manager>= 8.0.0 and <= 8.2.4.0
oracle communications session route manager>= 8.2.0 and <= 8.2.4
oracle jd edwards enterpriseone tools<= 9.2.5.3
oracle peoplesoft enterprise peopletoolsall versions
oracle utilities frameworkall versions
oracle webcenter portalall versions
oracle communications messaging serverall versions
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Affected Packages
7Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven
org.bouncycastle:bcprov-ext-jdk15on
HIGH
fixed in 1.67
Maven
org.bouncycastle:bcprov-ext-jdk16
HIGH
fixed in 1.67
Maven
org.bouncycastle:bcprov-jdk14
HIGH
fixed in 1.67
Maven
org.bouncycastle:bcprov-jdk15
HIGH
fixed in 1.67
Maven
org.bouncycastle:bcprov-jdk15on
HIGH
fixed in 1.67
Maven
org.bouncycastle:bcprov-jdk15to18
HIGH
fixed in 1.67
Maven
org.bouncycastle:bcprov-jdk16
HIGH
fixed in 1.67
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Related CVEs
6CVEs linked to this one by a shared weakness (CWE) or affected product - joins on data already in the engine, with the reason shown per row.
CVE-2020-8203
Prototype pollution attack when using _.zipObjectDeep in lodash before 4.17.20.
same product
HIGH
CVE-2020-5413
Spring Integration framework provides Kryo Codec implementations as an alternati...
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CRITICAL
CVE-2020-24750
FasterXML jackson-databind 2.x before 2.9.10.6 mishandles the interaction betwee...
same product
HIGH
CVE-2020-28500
Lodash versions prior to 4.17.21 are vulnerable to Regular Expression Denial of ...
same product
MEDIUM
CVE-2021-21290
Netty is an open-source, asynchronous event-driven network application framework...
same product
MEDIUM
CVE-2021-23337
Lodash versions prior to 4.17.21 are vulnerable to Command Injection via the tem...
1
same product
HIGH
📦
Fixed versions by distribution
4The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
suse sle15bouncycastle fixed in 0:1.71-150200.3.9.4
suse sle15bouncycastle-pg fixed in 0:1.71-150200.3.9.4
suse sle15bouncycastle-pkix fixed in 0:1.71-150200.3.9.4
suse sle15bouncycastle-util fixed in 0:1.71-150200.3.9.4
⚑
Vendor Advisories
13suse-csafopenSUSE-SU-2024:10661-1
🔗
References & Sources
25Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.