CriticalCVE-2024-57727

    SimpleHelp Path Traversal Vulnerability (CVE-2024-57727)

    Published In CISA KEV since Sources: pwn.watch, CVE.org

    What is affected, what to do

    SimpleHelp remote support software v5.5.7 and before is vulnerable to multiple path traversal vulnerabilities that enable unauthenticated remote attackers to download arbitrary files from the SimpleHelp host via crafted HTTP requests. These files include server configuration files containing various secrets and hashed user passwords.

    The vulnerability is being actively exploited; treat it as a priority. CISA lists it as used in ransomware campaigns. Update Simplehelp to version 5.5.8. Immediate actions, mitigation and detection rules are in the runbook below.

    Affected
    • Simplehelp lt *..5.5.8
    Fixed in
    • Simplehelp 5.5.8

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    9.1

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: pwn.watch, CVE.org

    96.8 %

    EPSS score

    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.

    Source: FIRST EPSS, percentile 99.89

    Show all metrics
    Severity
    Critical
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    249.84 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    actively exploitedSource: VulnCheck KEV (opens in a new tab) How we classify
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    9.1 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

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    96.8 %
    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    99.89
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    Actively exploited
    Published
    In CISA KEV since

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    CISA assessment (SSVC)
    Exploitation: active · automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 13 February 2025
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-22

    Response and mitigation

    Why act now?

    Prioritisation rationale

    This flaw is network-reachable without authentication or user interaction. It hands attackers configuration secrets and password hashes, which they turn into technician-account takeover and, from there, control of every managed endpoint. CISA flags confirmed use in ransomware campaigns, and the vulnerability sits among the CVEs most likely to be exploited. MSPs and organisations with internet-facing remote-support servers are the prime targets, because a single server gives attackers access to downstream customers. Treat any externally reachable, unpatched instance as a critical incident and assume compromise. Internal-only instances are still high priority and should be patched within days.

    1. Runbook step 1

      Immediate response (0-24 h)

      • Inventory now: Find every SimpleHelp server, including shadow IT, internet-exposed instances, and servers run by MSPs or vendors that reach into your estate. Per the CVE description, all versions up to and including 5.5.7 are affected.
      • Patch: Upgrade to SimpleHelp 5.5.8 or later. For older release branches, a patch is available from the vendor — check the vendor advisory for the exact version. Confirm the running version in the admin console after upgrading.
      • If you cannot upgrade immediately, pull the server off the internet: Restrict inbound access to the SimpleHelp web ports to VPN or admin source IPs, or stop the service. The default is HTTP/HTTPS; verify the actual ports in the server config.
      • Assume compromise and rotate secrets: The flaw exposes configuration files containing secrets (e.g. serverconfig.xml) and hashed user passwords. Reset all admin and technician passwords. Rotate every credential stored in the config, including the LDAP/AD bind account, SMTP credentials and API keys. Enforce MFA on technician accounts.
      • Preserve evidence before patching: Snapshot web and SimpleHelp logs, the configuration directory, and the technician and session lists. You need these to hunt for rogue accounts and sessions, and to support a potential NIS2 early warning, which is due within 24 h.
      • Triage endpoints running the SimpleHelp agent: A compromised server gives an attacker code execution on every connected client. Review session history and any technicians created since January 2025.

    2. Runbook step 2

      Mitigation layers

      • Network segmentation: Move the SimpleHelp server into a dedicated management DMZ. Restrict its outbound traffic to the destinations it actually needs. Block lateral paths from the server into client networks beyond the agent channel itself.
      • WAF/reverse-proxy rule: Drop requests with traversal sequences in the URI (../, ..%2f, %2e%2e, ..\, double-encoded variants). In particular, block traversal under /toolbox-resource/ and any request for configuration/ or serverconfig.xml. Suricata idea: http.uri; content:"/toolbox-resource/"; content:".."; distance:0;.
      • Front-door access control: Expose the technician and admin interface only via VPN/ZTNA with pre-authentication. Apply IP allowlisting or geo-restriction at the perimeter firewall.
      • IAM/least privilege: Scope technician groups to the client groups they actually need. Run the LDAP bind account as read-only with no privileged group memberships. Disable dormant technician accounts.
      • Endpoint hardening: Use EDR rules or application control to block, or at least alert on, the SimpleHelp agent spawning cmd.exe, powershell.exe or rundll32.exe. Block unsanctioned SimpleHelp/JWrapper installs on endpoints.
      • Supply chain: Require written confirmation of patch level and credential rotation from any third party that uses SimpleHelp to access your environment (NIS2 supply-chain security).

    3. Runbook step 3

      Detection rules

      • Web server / proxy logs: Hunt for traversal requests against SimpleHelp, e.g. KQL: CommonSecurityLog | where RequestURL has "toolbox-resource" and (RequestURL has ".." or RequestURL has "%2e%2e"). HTTP 200 responses with unusually large response sizes suggest successful file exfiltration.
      • Zeek/Suricata: Filter http.log for a uri containing serverconfig.xml, /configuration/ or .. against SimpleHelp hosts. Bursts of 404/200 responses from a single source indicate automated scanning.
      • SimpleHelp application logs: Look for newly created technician or admin accounts, logins from unfamiliar IPs, and password changes. Also correlate off-hours remote sessions and mass tool or script execution across many clients.
      • Sysmon EID 1 / EDR process ancestry: Watch for Remote Access.exe (the JWrapper/SimpleHelp agent) spawning cmd.exe, powershell.exe, net.exe, nltest.exe, rclone.exe or archivers. Sigma shape: ParentImage|contains: 'Remote Access' AND Image|endswith: ['\cmd.exe','\powershell.exe'].
      • Windows events: Flag Event ID 4720/4732 (account created / added to admin group) and 7045 (new service) shortly after SimpleHelp sessions. Use Sysmon EID 3 to spot agents beaconing to unknown, non-corporate SimpleHelp servers.

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Actively exploited: treat the vulnerability as a priority in vulnerability handling under Art. 21(2)(e) NIS2. If it is exploited in your environment, check the reporting obligation under Art. 23 (early warning within 24 hours).
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    Since 11.09.2026, manufacturers of affected products with digital elements must report actively exploited vulnerabilities under Art. 14 CRA, with an early warning within 24 hours via ENISA's single reporting platform.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    SimpleHelp remote support software v5.5.7 and before is vulnerable to multiple path traversal vulnerabilities that enable unauthenticated remote attackers to download arbitrary files from the SimpleHelp host via crafted HTTP requests. These files include server configuration files containing various secrets and hashed user passwords.

    Source: pwn.watch, CISA KEV Catalog, cvelistv5, NVD (NIST), CVE.org (MITRE)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    simple-helpsimplehelp
    • < 5.5.8
    • 5.5.8

    Vendors and products

    Weakness classes (CWE)

    • CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

      Base

      The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

      Entry at MITRE CWE-22

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    CISA KEV CatalogCISA Known Exploited Vulnerability (opens in a new tab)cisa.govactively exploited

    References & sources

    • horizon3.aiattack-research/disclosures/critical-vulnerabilities-in-simpleh…
    • simple-help.comkb---security-vulnerabilities-01-2025
    • cisa.govknown-exploited-vulnerabilities-catalog?field_cve=CVE-2024-57727government-resource
    • pwn.watchpwn.watch: SimpleHelp: Path Traversal Vulnerabilitypwn-watch
    • simple-help.comSimpleHelp advisory: SimpleHelppwn-watch
    • cisa.govCISA guidance: SimpleHelppwn-watch
    • NVD (NIST)NVD: CVE-2024-57727pwn-watch
    • cisa.govCISA Known Exploited Vulnerabilities Catalogpwn-watch
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