CVE-2023-42451

highpriority · track · 30EPSS 0.007 · 52 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.67% (52nd) EPSS

CVSS 7.5 · high

Is it mine?

15 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0-rc2, under certain circumstances, attackers can exploit a flaw in domain name normalization to spoof domains they do not own. Versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0-rc2 contain a patch for this issue.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.4highAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · security-advisories@github.comexploitability 2.2 · impact 5.2

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-706USCWE-706US

affected products (15)

Products and version ranges known to be affected.

mastodon mastodon≤ < 3.5.14enisa_euvdEU
mastodon mastodon4.0.0, → 4.0.10enisa_euvdEU
mastodon mastodon4.1.0, → 4.1.8enisa_euvdEU
mastodon mastodon4.2.0-beta1, → 4.2.0-rc2enisa_euvdEU
Mastodon gGmbH Mastodon≤ 3.5.14fstec_bduRU
Mastodon gGmbH Mastodon4.0.0 → 4.0.10fstec_bduRU
Mastodon gGmbH Mastodon4.1.0 → 4.1.8fstec_bduRU
Mastodon gGmbH Mastodon4.2.0 → 4.2.0-rc2fstec_bduRU
joinmastodon mastodon< 3.5.14nvdUScpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
joinmastodon mastodon4.0.0 → 4.0.10nvdUScpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
joinmastodon mastodon4.1.0 → 4.1.8nvdUScpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
joinmastodon mastodon= 4.2.0nvdUScpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
Bitnami mastodon< 3.5.14osvUSpkg:bitnami/mastodon
Bitnami mastodon4.0.0 → 4.0.10osvUSpkg:bitnami/mastodon
Bitnami mastodon4.1.0 → 4.1.8osvUSpkg:bitnami/mastodon

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-mastodon-2023-42451Mastodon Invalid Domain Name Normalization vulnerability2024-03-06vendor · osvUS
Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0, under certain circumstances, attackers can exploit a flaw in domain name normalization to spoof domains they do not own. Versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0 contain a patch for this issue.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd NVD CVE.org MITRE

published 2023-09-19modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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