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CVE-2024-1709

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in ConnectWise ScreenConnect. For every flaw being used in attacks, see Exploited flaws; for ConnectWise’s, see ConnectWise flaws being used in attacks.

CVE-2024-1709 is a security flaw in ConnectWise ScreenConnect, remote-support software IT providers use to manage their customers’ computers. Attackers can get into ConnectWise ScreenConnect without a valid password. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 22 Feb 2024, and says ransomware gangs have used it.[1]

ConnectWise ScreenConnect is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. ConnectWise has published a fix or advice.

Description

CISA calls it an authentication bypass in ConnectWise ScreenConnect. In its words: “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.”[1]

The underlying weakness is authentication bypass (CWE-288), in MITRE’s list of common software weaknesses.[2]

It scores 10.0 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; ConnectWise’s advisory has them[3]. CISA names the product as ConnectWise ScreenConnect.

Most families won’t have ConnectWise ScreenConnect; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 22 Feb 2024, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 29 Feb 2024 to fix it.[1] CISA says ransomware gangs have used it.

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at over 99%. That’s in the top 1% of the flaws it scores.[4]

CISA assesses it as automatable: attackers can run it against many targets at once.

CISA doesn’t say who was attacked, or how.

Fix

ConnectWise has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.”[1]

  1. Check whether you use it.ConnectWise ScreenConnect is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 29 Feb 2024 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 10.0.[2]
CISA adds it to its catalog of flaws known to be used in attacks, noting that ransomware gangs have used it.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at over 99%.[4]

See also

Other ConnectWise ScreenConnect flaws

Other authentication bypass flaws

  • CVE-2026-20079, Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management: firewall management center authentication bypass using an alternate path or channel ·
  • CVE-2026-19490, Citrix NetScaler: authentication bypass using an alternate path or channel ·
  • CVE-2026-18556, N-able N-central: authentication bypass using an alternate path or channel ·
  • CVE-2026-18577, N-able N-central: authentication bypass using an alternate path or channel ·
  • CVE-2026-1603, Ivanti Endpoint Manager (EPM): authentication bypass ·

Every ConnectWise flaw on CISA’s list · Everything added in February 2024

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “ConnectWise ScreenConnect Authentication Bypass Vulnerability”. Known Exploited Vulnerabilities Catalog, added 22 Feb 2024.
  2. ^ National Institute of Standards and Technology. “CVE-2024-1709 Detail”. National Vulnerability Database, published 21 Feb 2024.
  3. ^ ConnectWise. Advisories and fixes: connectwise.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 1.000, percentile 100.0, 31 Oct 2026.
  5. CVE Program. “CVE-2024-1709”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.