How severe is CVE-2020-8912?

CVE-2020-8912 has a CVSS 3.x base score of 2.5, rated low severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2020-8912 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8912?

CVE-2020-8912 affects Amazon Aws S3 Crypto Sdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8912?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-8912 published?

CVE-2020-8912 was published on 2020-08-11 and last updated on 2026-06-17.

CVE-2020-8912

CVE-2020-8912 is a low-severity vulnerability in Amazon Aws S3 Crypto Sdk with a CVSS 3.x base score of 2.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: Low (CVSS 3.x base score 2.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Amazon Aws S3 Crypto Sdk
Published: 2020-08-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-8912?: 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.
How severe is CVE-2020-8912?: CVE-2020-8912 has a CVSS 3.x base score of 2.5, rated low severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2020-8912 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8912?: CVE-2020-8912 affects Amazon Aws S3 Crypto Sdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8912?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-8912 published?: CVE-2020-8912 was published on 2020-08-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:*

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