CVE-2020-25021

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 2.6%, top 17% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in Noise-Java through 2020-08-27. ChaChaPolyCipherState.encryptWithAd() allows out-of-bounds access.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
83.4%
KEV
Not listed

Published

September 4, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Jul 7, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
github_pr

Boundary checks improvement: detect when plaintextOffset + length is greater than length

Fix merged in rweather/noise-java PR #12 on 2020-09-03 — awaiting tagged release

https://github.com/rweather/noise-java/pull/12
github_commit

commit 18e86b6f8bea (rweather/noise-java)

Fix landed in rweather/noise-java commit 18e86b6f8bea — awaiting tagged release

https://github.com/rweather/noise-java/commit/18e86b6f8bea7326934109aa9ffa705ebf4bde90
generic🟡 PoC Available

Full Disclosure: Noise-Java ChaChaPolyCipherState.encryptWithAd() insufficient boundary checks

http://seclists.org/fulldisclosure/2020/Sep/14

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-24 14:14 UTCEPSS rescore
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  70. 2026-05-26 23:29 UTCGHSA enrichment
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Frequently asked(5)

What is CVE-2020-25021?
CVE-2020-25021 is a critical vulnerability published on September 4, 2020. An issue was discovered in Noise-Java through 2020-08-27. ChaChaPolyCipherState.encryptWithAd() allows out-of-bounds access.
When was CVE-2020-25021 disclosed?
CVE-2020-25021 was first published in the National Vulnerability Database on September 4, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-25021 actively exploited?
CVE-2020-25021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-25021?
CVE-2020-25021 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-25021?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25021, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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