CVE-2025-68667

CRITICALNVD 9.99.9
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.6% (48th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2025-205026 (ENISA EUVD)Source: ENISA EUVD

9.9EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.9Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's description, written by its CNA (GitHub, Inc.), states the affected versions: "Affected products include Conduit prior to version 0.10.10, continuwuity prior to version 0.5.0, Grapevine prior to commit `9a50c244`, and tuwunel prior to version 1.4.8." No release containing a fix is confirmed on record.

Conduit is a chat server powered by Matrix. A vulnerability that affects a number of Conduit-derived homeservers allows a remote, unauthenticated attacker to force the target server to cryptographically sign arbitrary membership events. Affected products include Conduit prior to version 0.10.10, continuwuity prior to version 0.5.0, Grapevine prior to commit 9a50c244, and tuwunel prior to version 1.4.8. The flaw exists because the server fails to validate the origin of a signing request, provided the event's state_key is a valid user ID belonging to the target server. Attackers can forge "leave" events for any user on the target server. This forcibly removes users (including admins and bots) from rooms. This allows denial of service and/or the removal of technical protections for a room (including policy servers, if all users on the policy server are removed). Attackers can forge "invite" events from a victim user to themselves, provided they have an account on a server where there is an account that has the power level to send invites. This allows the attacker to join private or invite-only rooms accessible by the victim, exposing confidential conversation history and room state. Attackers can forge "ban" events from a victim user to any user below the victim user's power level, provided the victim has the power level to issue bans AND the target of the ban resides on the same server as the victim. This allows the attacker to ban anyone in a room who is on the same server as the vulnerable one, however cannot exploit this to ban users on other servers or the victim themself. Conduit fixes the issue in version 0.10.10. continuwuity fixes the issue in commits 7fa4fa98 and b2bead67, released in 0.5.0. tuwunel fixes the issue in commit dc9314de1f8a6e040c5aa331fe52efbe62e6a2c3, released in 1.4.8. Grapevine fixes the issue in commit 9a50c2448abba6e2b7d79c64243bb438b351616c. As a workaround, block access to the PUT /_matrix/federation/v2/invite/{roomId}/{eventId} endpoint using your reverse proxy.

CVSS v3
9.9
EG Score
9.9CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity99% × 45%
Impact severity (EG Severity): CVSS 9.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.9): severity, escalated by confirmed exploitation. This CVE's 9.9 is its impact severity (EG Severity), not escalated.

EG Severity
9.9 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 23, 2025

Last Modified

October 19, 2026

Advisory Details (6)

Auto-updated Oct 26, 2026
No fix on record yet. Sources: github, github_commit.
Web page

v0.10.10 · Famedly / Conduit · GitLab

https://gitlab.com/famedly/conduit/-/releases/v0.10.10
GitHub commit

commit dc9314de1f8a (matrix-construct/tuwunel)

Fix landed in matrix-construct/tuwunel commit dc9314de1f8a — awaiting tagged release

https://github.com/matrix-construct/tuwunel/commit/dc9314de1f8a6e040c5aa331fe52efbe62e6a2c3
GitHub advisoryMentions a patch (unverified)

Unintended Proxy or Intermediary ('Confused Deputy') and Improper Input Validation in Conduit-derived homeservers · Advisory · continuwuity/continuwuity · GitHub

https://github.com/continuwuity/continuwuity/security/advisories/GHSA-22fw-4jq7-g8r8
Web page

fix: Apply additional validation to invites · b2bead67ac - continuwuation/continuwuity - Ellis Git

https://forgejo.ellis.link/continuwuation/continuwuity/commit/b2bead67ac8bc45de9a612578f295e5b7fc6c2b5
Web page

fix: Also check sender origin · 7fa4fa9862 - continuwuation/continuwuity - Ellis Git

https://forgejo.ellis.link/continuwuation/continuwuity/commit/7fa4fa98628593c1a963f5aa8dbc3657d604b047
Web page

validate event type and membership for create_join and create_invite (9a50c244) · Commits · Matrix projects / Grapevine · GitLab

https://gitlab.computer.surgery/matrix/grapevine/-/commit/9a50c2448abba6e2b7d79c64243bb438b351616c

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 53× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 233 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 134 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-11-01 13:53 UTCEG score recompute
  3. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
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  1. 2026-10-19 18:53 UTCEG score recompute
  2. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-10-18 19:13 UTCEG score recompute
  4. 2026-10-18 05:17 UTCEG score recompute
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  6. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
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  8. 2026-10-16 16:39 UTCEPSS rescoreEPSS 0.6% · 47th percentile
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  10. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  11. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  12. 2026-10-14 11:07 UTCEG score recompute
  13. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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  15. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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  19. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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  22. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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  27. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  28. 2026-10-03 13:09 UTCOSV refresh
  29. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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  42. 2026-09-14 05:50 UTCOSV refresh
  43. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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  58. 2026-08-26 07:13 UTCOSV refresh
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  73. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  74. 2026-08-09 22:58 UTCEG score recompute

Frequently asked(5)

What is CVE-2025-68667?
CVE-2025-68667 is a critical-severity vulnerability; its CVE record was published on December 23, 2025. Conduit is a chat server powered by Matrix. A vulnerability that affects a number of Conduit-derived homeservers allows a remote, unauthenticated attacker to force the target server to cryptographically sign arbitrary membership events. Affected products include Conduit prior to version 0.10.10,…
When was the CVE record for CVE-2025-68667 published?
The CVE record for CVE-2025-68667 was published on December 23, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2025-68667 actively exploited?
CVE-2025-68667 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-68667?
CVE-2025-68667 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2025-68667?
No fix for CVE-2025-68667 is confirmed yet. Until one is published, restrict network exposure of the affected system — for example, keep it off the internet or limit it to trusted networks — and watch for a fix. The CVE record's description, written by its CNA (GitHub, Inc.), states the affected versions: "Affected products include Conduit prior to version 0.10.10, continuwuity prior to version 0.5.0, Grapevine prior to commit `9a50c244`, and tuwunel prior to version 1.4.8." No release containing a fix is confirmed on record.

Dependency Blast Radius

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