Security readout for executives and security teams
Plain-English summary
ReadyTalk Avian 1.2.0 before 2020-10-27 has an integer overflow in file output handling. The bug can bypass a memory boundary check and allow out-of-bounds access. The maintainer no longer supports affected products, so organizations should treat any remaining use as technical debt requiring removal or carefully verified patching.
Executive priority
Prioritize discovery and replacement if Avian remains in business systems. The issue is memory-safety related, but source evidence lacks severity scoring or exploitation confirmation, so urgency depends on whether the unsupported component is deployed and reachable by untrusted data.
Technical view
The issue is in FileOutputStream.write() in FileOutputStream.java. A boundary check intended to prevent out-of-bounds memory reads or writes can be bypassed through integer overflow, leading to out-of-bounds access. The public record names ReadyTalk Avian 1.2.0 before 2020-10-27 and references an upstream pull request and commit.
Likely exposure
Exposure is likely limited to systems still embedding or building on ReadyTalk Avian 1.2.0 code from before 2020-10-27, including private forks. The CVE notes affected products are no longer supported by the maintainer.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV in the supplied bundle. No public exploit status, CVSS score, or practical attack preconditions are provided here.
Researcher notes
Focus analysis on integer arithmetic around FileOutputStream.write() bounds validation and whether downstream forks carried the 2020-10-27 fix. Avoid assuming broader product impact beyond ReadyTalk Avian from the supplied sources.
Mitigation direction
- Inventory applications and forks for ReadyTalk Avian usage.
- Replace unsupported Avian where feasible.
- If retained, apply the referenced upstream fix or later verified code.
- Reduce exposure to untrusted file or stream inputs.
- Monitor vendor or project guidance for any additional remediation details.
Validation and detection
- Confirm whether Avian 1.2.0 or older code is present.
- Check whether FileOutputStream.java includes the referenced fix commit.
- Review vendored forks and build artifacts, not only package manifests.
- Run regression tests covering large write bounds and overflow-adjacent lengths.
- Document unsupported runtime dependencies for risk acceptance or replacement.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2020-28371 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ReadyTalk/avian/commit/0871979b298add320ca63f65060acb7532c8a0ddCVE reference · x_refsource_MISC
- https://github.com/ReadyTalk/avian/pull/572CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.