CVE-2024-1709: ConnectWise ScreenConnect Authentication Bypass Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Yes, if you run ConnectWise ScreenConnect. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-02-22, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-02-29; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns.
• EPSS 100.0%, percentile 100.0: FIRST’s model estimates a 100.0% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Editorial verdict: Act now. ScreenConnect Auth Bypass CVE-2024-1709 (CVSS 10) — Any on-premises ScreenConnect server still below 23.9.8 should be treated as compromised until proven otherwise; cloud-hosted customers were patched by ConnectWise.

What it is

ConnectWise ScreenConnect 23.9.7 and prior are affected by an Authentication Bypass Using an Alternate Path or Channel vulnerability, which may allow an attacker direct access to confidential information or critical systems.

CISA’s summary

ConnectWise ScreenConnect contains an authentication bypass vulnerability that allows an attacker with network access to the management interface to create a new, administrator-level account on affected devices.

Weakness type: CWE-288.

Product: ConnectWise ScreenConnect · Assigned by: cisa-cg · Published: 2024-02-21

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Privileges required: none (no login)
• User interaction: none
• Scope: changed (can affect other components)

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: added 2024-02-22; federal due date 2024-02-29. Known ransomware use: Known.
• CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
• CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 99.98% probability of exploitation activity in the next 30 days; percentile 100.0.

Timeline

• 2024-02-19 — erroneo.us brief: ScreenConnect Auth Bypass CVE-2024-1709 (CVSS 10)
• 2024-02-21 — CVE record published by cisa-cg
• 2024-02-22 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2024-02-29 — CISA remediation deadline for US federal agencies
• 2025-10-21 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. Listed in CISA KEV notes (connectwise.com) connectwise.com

Vulnerability records

1. CVE.org record CVE-2024-1709 cve.org
2. NVD entry CVE-2024-1709 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

1. huntress.com huntress.com
2. huntress.com huntress.com
3. bleepingcomputer.com bleepingcomputer.com
4. github.com github.com
5. github.com github.com
6. horizon3.ai horizon3.ai
7. techcrunch.com techcrunch.com
8. securityweek.com securityweek.com
9. huntress.com huntress.com

All exploited ConnectWise vulnerabilities · Today’s Security Digest