CVE-2020-8912
In-band key negotiation issue in AWS S3 Crypto SDK for GoLang
- Published
- Updated
- Reserved
- Assigned by
Description
A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GoogleCNA (assigner) | 3.1 | Low2.5 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVDNVD · Modified | 3.1 | Low2.5 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.5.
Weakness
Affected products
Google LLC · AWS S3 Crypto SDK for GoLang
- affected stable – ≤ V1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/aws/aws-sdk-goGHSA-7f33-f4f5-xwgw (opens in a new tab)
References (2)
- https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-7f33-f4f5-xwgw (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-8912)Record last updated .