CVE-2007-0451

Status: ModifiedMedium (4.3)—
Apache SpamAssassin before 3.1.8 allows remote attackers to cause a denial of service via long URLs in malformed HTML, which triggers "massive memory usage."
CVSS

Version: 2.0
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
Base score: 4.3
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 6.87%
Percentile among all scored CVEs: 94
Score date: 10/5/2026
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)

Apache — Spamassassin
CWEs

CWE-399
References

Raw JSON (NVD)

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{
  "id": "CVE-2007-0451",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ]
  },
  "affected": [
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      "affectedData": [
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          "product": "n/a",
          "versions": [
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              "version": "n/a"
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  "published": "2007-02-16T19:28:00.000",
  "references": [
    {
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-399"
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  "descriptions": [
    {
      "lang": "en",
      "value": "Apache SpamAssassin before 3.1.8 allows remote attackers to cause a denial of service via long URLs in malformed HTML, which triggers \"massive memory usage.\""
    },
    {
      "lang": "es",
      "value": "Apache SpamAssassin versiones anteriores a 3.1.8, permite a atacantes remotos causar una denegación de servicio por medio de URLs largas en HTML malformado, que desencadena un \"massive memory usage”"
    }
  ],
  "lastModified": "2026-06-16T22:35:35.647",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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  "evaluatorSolution": "Upgrade to SpamAssassin version 3.1.8"
}