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CVE Record

CVE-2020-7779: Regular Expression Denial of Service (ReDoS)

All versions of package djvalidator are vulnerable to Regular Expression Denial of Service (ReDoS) by sending crafted invalid emails - for example, --@------------------------------------------------------------------------------------------------------------------------!.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-7779 is a denial-of-service risk in the JavaScript package djvalidator. A specially malformed email address can trigger inefficient regular-expression processing, potentially slowing or disrupting applications that validate untrusted email input with this package.

Executive priority

Treat as a moderate operational availability issue. Prioritize internet-facing applications using djvalidator, especially signup, contact, or account workflows where anonymous users can submit email addresses repeatedly.

Technical view

The issue is Regular Expression Denial of Service in djvalidator email validation. The CVSS 3.1 score is 5.3: network reachable, low complexity, no privileges or user interaction, with limited availability impact and no stated confidentiality or integrity impact.

Likely exposure

Exposure is most likely in Node.js applications that include djvalidator and validate user-supplied email addresses on public forms, APIs, signup flows, or contact endpoints. The bundle identifies djvalidator as affected and says all versions are vulnerable.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The described attack condition is remote submission of crafted invalid email input that causes excessive regex processing.

Researcher notes

Evidence is limited to the CVE record and Snyk reference in the bundle. No CWE, patch version, or active exploitation signal is provided here, so remediation should be verified against current package and vendor guidance.

Mitigation direction

  • Inventory applications for direct or transitive use of djvalidator.
  • Check Snyk or vendor guidance for fixed versions or replacement advice.
  • Replace or remove djvalidator where no maintained fix is available.
  • Add input length limits, request timeouts, and rate limits around email validation.
  • Monitor affected services for CPU spikes, latency, and validation error surges.

Validation and detection

  • Confirm package manifests and lockfiles for djvalidator dependency presence.
  • Identify public routes or APIs that validate user-supplied email addresses with this library.
  • Run controlled non-production ReDoS checks using approved internal testing tools.
  • Verify dependency update or replacement removes djvalidator from deployed artifacts.
Prepared
Confidence
medium
Sources
3

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

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CVE-2020-7779 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
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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
2Source 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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2020-7779Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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
n/adjvalidator0Listed
Weakness

CWE details

No CWE listed

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