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CVE Record

CVE-2021-20784: HTTP header injection vulnerability in Everything version 1.0, 1.1, and 1.2 except the Lite version may all...

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.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Everything 1.0, 1.1, and 1.2 non-Lite releases contain an HTTP header injection issue. If a website uses the affected product, a remote attacker could influence headers to inject script or alter displayed website content. The known severity is medium, and the source bundle does not show confirmed active exploitation.

Executive priority

Treat as a moderate web integrity risk. Prioritize systems where affected Everything versions support public or business-critical websites, because the impact is content alteration or script injection. The provided evidence does not justify emergency response unless local exposure is confirmed.

Technical view

CVE-2021-20784 is an HTTP header injection vulnerability tracked as CWE-644 with CVSS 3.0 score 6.1. The vector is network-accessible, low complexity, no privileges, and requires user interaction. Impact is limited confidentiality and integrity with changed scope, and no availability impact is indicated.

Likely exposure

Exposure is most likely where voidtools Everything 1.0, 1.1, or 1.2 non-Lite versions are deployed and used by a website or web-facing workflow. Lite versions are explicitly excluded in the source bundle. The bundle does not identify affected operating environments or specific configurations.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source here confirms active exploitation. The CVSS vector indicates exploitation would require user interaction. The described outcome is script injection or website alteration through HTTP header injection, not direct system compromise.

Researcher notes

The source bundle provides affected version ranges, CVSS, CWE, and high-level impact, but not a concrete fixed version or detailed mitigation. Avoid assuming exploit availability or patch status from this data alone. Focus validation on version, Lite exclusion, and whether a website actually uses the affected product.

Mitigation direction

  • Inventory Everything installations and identify any 1.0, 1.1, or 1.2 non-Lite deployments.
  • Check JVN and voidtools guidance for the supported remediation path.
  • Upgrade or replace affected non-Lite versions when vendor guidance confirms a safe target version.
  • Reduce exposure of any website workflow that depends on affected versions until remediation is complete.
  • Document exceptions where Lite versions or unaffected versions are confirmed.

Validation and detection

  • Confirm installed Everything version and whether it is Lite or non-Lite.
  • Map any website or web-facing workflow using the product.
  • Review vendor and JVN advisories for affected-version wording and remediation status.
  • Validate that affected versions are removed, upgraded, or otherwise handled through approved risk acceptance.
  • Record evidence for vulnerability management tracking and retesting.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-644: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2021-20784 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.1CVSS 3.0MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

6.1Medium
CVSS 3.0 vector shape for CVE-2021-20784Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
voidtoolsEverythingall versions of 1.0 (Everything 1.0 series) except the Lite versionListed
voidtoolsEverythingall versions of 1.1 (Everything 1.1 series) except the Lite versionListed
voidtoolsEverythingall versions of 1.2 (Everything 1.2 series) except the Lite versionListed
Weakness

CWE details

CWE-644

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.