CVE-2021-20784

MEDIUMNVD 6.16.1—

6.1

HTTP header injection vulnerability in Everything version 1.0, 1.1, and 1.2 except the Lite version may allow a remote attacker to inject an arbitrary script or alter the website that uses the product.

CVSS v3: 6.1
EG Score: 6.1(medium)
EPSS: 74.9%
KEV: Not listed

Published

July 14, 2021

Last Modified

December 3, 2024

References (6)

vultures@jpcerthttps://jvn.jp/en/jp/JVN68971465/
vultures@jpcerthttps://www.voidtools.com/
vultures@jpcerthttps://www.voidtools.com/downloads/
af854a3a-2127-422b-91ae-364da2661108https://jvn.jp/en/jp/JVN68971465/index.html
af854a3a-2127-422b-91ae-364da2661108https://www.voidtools.com/
af854a3a-2127-422b-91ae-364da2661108https://www.voidtools.com/downloads/

Weakness Classification(1)

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

CWE-644Improper Neutralization of HTTP Headers for Scripting Syntax

Data Freshness Timeline

(refreshed 9× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:46 UTCEG score recompute
2026-05-26 13:46 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch

Frequently asked(5)

What is CVE-2021-20784?

CVE-2021-20784 is a medium vulnerability published on July 14, 2021. HTTP header injection vulnerability in Everything version 1.0, 1.1, and 1.2 except the Lite version may allow a remote attacker to inject an arbitrary script or alter the website that uses the product.

When was CVE-2021-20784 disclosed?

CVE-2021-20784 was first published in the National Vulnerability Database on July 14, 2021, with the most recent update on December 3, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-20784 actively exploited?

CVE-2021-20784 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 74.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-20784?

CVE-2021-20784 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2021-20784?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20784, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-20784

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CVE-2021-20784

📅 Published

🔄 Last Modified

🔗 References (6)