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CVE Record

CVE-2016-1000342: In the Bouncy Castle JCE Provider version 1.55 and earlier ECDSA does not fully validate ASN.1 encoding of...

In the Bouncy Castle JCE Provider version 1.55 and earlier ECDSA does not fully validate ASN.1 encoding of signature on verification. It is possible to inject extra elements in the sequence making up the signature and still have it validate, which in some cases may allow the introduction of 'invisible' data into a signed structure.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Older Bouncy Castle Java cryptography libraries could accept an ECDSA signature even when extra hidden data was added inside the signature structure. This matters where business systems rely on signatures to prove that signed content is exact and unmodified.

Executive priority

Treat as a dependency hygiene and integrity-risk issue. It is not shown as actively exploited, but old cryptographic libraries can quietly weaken trust boundaries in authentication, signing, and document or message validation workflows.

Technical view

Bouncy Castle JCE Provider 1.55 and earlier did not fully validate ASN.1 encoding during ECDSA signature verification. Extra elements could be injected into the signature sequence while verification still succeeded, potentially allowing invisible data in signed structures depending on application handling.

Likely exposure

Exposure is most likely in Java applications, products, appliances, or Linux distribution packages that bundled Bouncy Castle JCE Provider 1.55 or earlier. The provided affected metadata is incomplete, so dependency inventory is required.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Practical impact depends on whether an application treats signed ASN.1 structures as security-critical and accepts attacker-supplied signatures.

Researcher notes

Focus on strict ASN.1 parsing behavior in ECDSA verification and on applications that preserve or reinterpret signed structures after verification. Evidence supports malformed signature acceptance, but not broad product-specific exploitability from the provided sources.

Mitigation direction

  • Inventory Java dependencies for Bouncy Castle JCE Provider 1.55 or earlier.
  • Apply vendor security updates from your OS, appliance, or application vendor.
  • Move affected bundled libraries to a vendor-approved fixed version.
  • Check Debian, Ubuntu, Red Hat, Oracle, and NetApp guidance where applicable.

Validation and detection

  • Search SBOMs and build manifests for bcprov or Bouncy Castle components.
  • Confirm deployed runtime classpaths do not load version 1.55 or earlier.
  • Review vendor package changelogs for CVE-2016-1000342 remediation.
  • Prioritize systems verifying externally supplied ECDSA signatures or signed structures.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
8Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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