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CVE-2001-1183

Status: ModifiedMedium (5)—
Severity5Medium · CVSS 2.0
Exploitation probability3.82 %higher than 90% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

PPTP implementation in Cisco IOS 12.1 and 12.2 allows remote attackers to cause a denial of service (crash) via a malformed packet.

CVSS

Base score
5
Version
2.0
Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
3.82 %
Percentile among all scored CVEs
90
Score date
10/23/2026

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).

Affected technologies (1)

Cisco — IOS

CWEs

References

Show 10 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2001-1183",
  "cveTags": [],
  "metrics": {
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
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        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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      "affectedData": [
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  ],
  "published": "2001-07-12T04:00:00.000",
  "references": [
    {
      "url": "http://www.cisco.com/warp/public/707/PPTP-vulnerability-pub.html",
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  "vulnStatus": "Modified",
  "weaknesses": [
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  "lastModified": "2026-06-16T21:55:44.760",
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}