{"cve":"CVE-2020-8897","nvd":{"published":"2020-11-16T12:15:14.557","modified":"2026-06-17T03:27:08.833","status":"Modified","description":"A weak robustness vulnerability exists in the AWS Encryption SDKs for Java, Python, C and Javalcript prior to versions 2.0.0. Due to the non-committing property of AES-GCM (and other AEAD ciphers such as AES-GCM-SIV or (X)ChaCha20Poly1305) used by the SDKs to encrypt messages, an attacker can craft a unique cyphertext which will decrypt to multiple different results, and becomes especially relevant in a multi-recipient setting. We recommend users update their SDK to 2.0.0 or later.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-327","CWE-310"],"references":["https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/","https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf","https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/","https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf"],"products":["amazon:aws_encryption_sdk"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-8897","score":0.00399,"percentile":0.34172,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-wqgp-vphw-hphf","url":"https://osv.dev/vulnerability/GHSA-wqgp-vphw-hphf","summary":"Security issues in AWS KMS and AWS Encryption SDKs: in-band protocol negotiation and robustness","modified":"2026-09-10T03:49:09.519595036Z","packages":[{"ecosystem":"Maven","name":"com.amazonaws:aws-encryption-sdk-java","purl":"pkg:maven/com.amazonaws/aws-encryption-sdk-java","ranges":["<2.0.0"],"fixed":["2.0.0"]},{"ecosystem":"PyPI","name":"aws-encryption-sdk","purl":"pkg:pypi/aws-encryption-sdk","ranges":["<2.0.0"],"fixed":["2.0.0"]}]},{"id":"PYSEC-2020-261","url":"https://osv.dev/vulnerability/PYSEC-2020-261","summary":"","modified":"2025-10-09T06:53:18.019386Z","packages":[{"ecosystem":"PyPI","name":"aws-encryption-sdk","purl":"pkg:pypi/aws-encryption-sdk","ranges":["<2.0.0"],"fixed":["2.0.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}