How severe is CVE-2020-8897?

CVE-2020-8897 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-8897 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8897?

CVE-2020-8897 affects Amazon Aws Encryption Sdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8897?

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

When was CVE-2020-8897 published?

CVE-2020-8897 was published on 2020-11-16 and last updated on 2026-06-17.

CVE-2020-8897

CVE-2020-8897 is a medium-severity vulnerability in Amazon Aws Encryption Sdk with a CVSS 3.x base score of 4.8. 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: Medium (CVSS 3.x base score 4.8)
CVSS v2: 5.5
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Amazon Aws Encryption Sdk
Published: 2020-11-16
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-8897?: 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.
How severe is CVE-2020-8897?: CVE-2020-8897 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-8897 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8897?: CVE-2020-8897 affects Amazon Aws Encryption Sdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8897?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-8897 published?: CVE-2020-8897 was published on 2020-11-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:amazon:aws_encryption_sdk:*:*:*:*:*:*:*:*

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