CVE-2024-55884

Status: DeferredCritical (9)—

In the Mullvad VPN client 2024.6 (Desktop), 2024.8 (iOS), and 2024.8-beta1 (Android), the exception-handling alternate stack can be exhausted, leading to heap-based out-of-bounds writes in enable() in exception_logging/unix.rs, aka MLLVD-CR-24-01. NOTE: achieving code execution is considered non-trivial.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Base score: 9

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 1.31%
Percentile among all scored CVEs: 70
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access75 %

Vulnerabilidad en cliente VPN accesible por red (AV:N) sin autenticación (PR:N) que permite buffer overflow (CWE-787) con impacto crítico en confidencialidad e integridad, indicando ejecución de código potencial aunque compleja.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Mullvad — VPN Client^AI

CWEs

CWE-787

References

Raw JSON (NVD)

Show

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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2024-12-12T16:15:36.813815Z"
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        "source": "cve@mitre.org",
        "cvssData": {
          "scope": "CHANGED",
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          "baseScore": 9,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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      "affectedData": [
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  "published": "2024-12-12T02:08:23.127",
  "references": [
    {
      "url": "https://github.com/mullvad/mullvadvpn-app/commit/ef6c862071b26023802b00d6e1dc6ca53d1ab3e6",
      "source": "cve@mitre.org"
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    {
      "url": "https://news.ycombinator.com/item?id=42390768",
      "source": "cve@mitre.org"
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      "url": "https://x41-dsec.de/news/2024/12/11/mullvad/",
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      "value": "In the Mullvad VPN client 2024.6 (Desktop), 2024.8 (iOS), and 2024.8-beta1 (Android), the exception-handling alternate stack can be exhausted, leading to heap-based out-of-bounds writes in enable() in exception_logging/unix.rs, aka MLLVD-CR-24-01. NOTE: achieving code execution is considered non-trivial."
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      "lang": "es",
      "value": "En Mullvad VPN client 2024.6 (Escritorio), 2024.8 (iOS) y 2024.8-beta1 (Android), la pila alternativa de manejo de excepciones se puede agotar, lo que genera escrituras fuera de los límites basadas en el montón en enable() en exception_logging/unix.rs, también conocido como MLLVD-CR-24-01. NOTA: lograr la ejecución del código se considera no trivial."
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  "lastModified": "2026-06-17T08:11:24.230",
  "sourceIdentifier": "cve@mitre.org"
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