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No exploitation reportedFix available

CVE-2021-23400

No exploitation reported by the sources we read.

  • Published2021-06-29
  • Fixed in6.6.1
  • WeaknessCWE-74

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The package nodemailer before 6.6.1 are vulnerable to HTTP Header Injection if unsanitized user input that may contain newlines and carriage returns is passed into an address object.

Timeline

dates in UTC
  1. 2021-06-2912:15CVE publishedNVD

Versions per branch

NVD · OSV
Nodemailer
BranchAffectedFixed in
6.6< 6.6.16.6.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • node-nodemailerUbuntu:22.04:LTSall versions · no fixed version listed
  • node-nodemailerUbuntu:20.04:LTSall versions · no fixed version listed
  • node-nodemailerDebian:14all versions · fixed in 6.4.17-3
  • node-nodemailerDebian:13all versions · fixed in 6.4.17-3
  • node-nodemailerDebian:12all versions · fixed in 6.4.17-3
  • nodemailerTuxCare:npmfrom 2.7.2-tuxcare.0 · fixed in 2.7.2-tuxcare.1

Full record on NVD

Fix

  1. Update Nodemailer to 6.6.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.16.3known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.06.8read 2026-10-23
  • NVDweakness (CWE)CWE-74read 2026-10-23
  • FIRST EPSSEPSS score1.4 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2021-06-30

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-06-29
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-hwqf-gcqm-7353

Frequently asked questions

What is CVE-2021-23400?

The package nodemailer before 6.6.1 are vulnerable to HTTP Header Injection if unsanitized user input that may contain newlines and carriage returns is passed into an address object.

Is CVE-2021-23400 actively exploited?

Active exploitation of CVE-2021-23400 has not been confirmed. Its EPSS score was 1.4% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23400?

CVE-2021-23400 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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