Raw vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2023-47257 is a high-severity Code Injection (CWE-94) vulnerability in Connectwise Automate. Its CVSS base score is 8.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked in the top 37% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
ConnectWise ScreenConnect through version 23.8.4 contains a vulnerability that permits man-in-the-middle attackers to achieve remote code execution by sending crafted messages to the application. The flaw is tracked as CVE-2023-47257 with a CVSS 3.1 score of 8.1 and is associated with CWE-94 improper control of generation of code. It affects the ScreenConnect remote access and support product when network communication occurs without sufficient integrity protections.
An unauthenticated network attacker positioned to intercept or modify traffic between ScreenConnect components can supply malicious messages that result in arbitrary code execution on the target system. The attack requires no user interaction or credentials and can lead to full confidentiality, integrity, and availability impacts once code execution is obtained, although the high attack complexity reflects the need for a successful man-in-the-middle position.
The vendor ConnectWise released a security bulletin addressing the issue in the 23.8 release series and advises customers to apply the available updates. Public references also include third-party analysis confirming the same remediation path. The EPSS score has remained flat at 0.0672 with no observed increase after disclosure.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-51388
Vulnerability Data
ConnectWise ScreenConnect through 23.8.4 allows man-in-the-middle attackers to achieve remote code execution via crafted messages.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V1.3.1
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and evaluation finds code paths that accept and execute externally influenced strings.
Input validation directly stops untrusted data from being used to construct executable code without neutralization.
Least privilege limits the damage an injected code fragment can perform once executed.
Requiring documented secure development standards and tools enforces use of safe code-generation APIs and escaping.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
PR.PS-06's SDLC practices directly target injection flaws via secure coding and testing (mostly), yet as a single broad outcome it leaves many code-generation specifics unaddressed (partial).
PR.DS-10 protects runtime data confidentiality/integrity but has no bearing on neutralizing externally influenced input during code generation, so neither direction shows any preventive effect.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.