Security readout for executives and security teams
Plain-English summary
This issue affects older AWS Encryption SDKs. In specific cryptographic workflows, an attacker could create one ciphertext that decrypts differently for different recipients, undermining message integrity. The business concern is corrupted or misleading decrypted data, not data disclosure. Sources recommend upgrading affected SDKs to version 2.0.0 or later.
Executive priority
Schedule remediation in the normal security update cycle unless the organization has high-value multi-recipient encrypted workflows. Escalate if vulnerable SDKs process externally supplied ciphertext or business-critical integrity decisions depend on decrypted content.
Technical view
AWS Encryption SDKs for Java, Python, C, and JavaScript before 2.0.0 used non-committing AEAD encryption. Because ciphertexts were not bound to a single plaintext/key context, crafted ciphertext could produce multiple valid decryptions, especially in multi-recipient use. CVSS 4.8 reflects high complexity, low privileges, and user interaction, with integrity impact.
Likely exposure
Exposure is likely limited to applications using affected AWS Encryption SDK versions for client-side encryption and decryption. Plain AWS KMS use is not enough by itself based on the provided sources. Multi-recipient encrypted message workflows deserve priority review.
Exploitation context
The source bundle does not show active exploitation, and this CVE is not listed as KEV. Exploitation is described as high complexity and context-dependent, requiring a crafted ciphertext and a vulnerable decryption workflow. Treat it as an integrity risk in sensitive encrypted-data pipelines.
Researcher notes
Evidence supports a cryptographic robustness flaw, not a general AWS KMS compromise. The affected product metadata is broad, while the description specifically names AWS Encryption SDKs before 2.0.0. Validate exact package names and versions from project manifests and vendor advisories.
Mitigation direction
- Upgrade affected AWS Encryption SDKs to version 2.0.0 or later.
- Review AWS guidance on key commitment and explicit KeyIds.
- Prioritize systems handling multi-recipient encrypted messages.
- Confirm compatibility before decrypting legacy ciphertext at scale.
- Check vendor guidance for language-specific migration details.
Validation and detection
- Inventory AWS Encryption SDK versions in Java, Python, C, and JavaScript projects.
- Identify services decrypting data from untrusted or shared sources.
- Review whether encrypted messages use multi-recipient workflows.
- Confirm upgraded SDKs are deployed in all encryption and decryption paths.
- Add regression tests for legacy ciphertext handling during migration.
Public sources used
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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2020-8897 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N1.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphfCVE reference · x_refsource_CONFIRM
- https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/CVE reference · x_refsource_CONFIRM
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.
Cryptographic Issues
Cryptographic Issues represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.