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CVE-2021-37148

Status: ModifiedHigh (7.5)—

Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.

CVSS

Exploitation probability (EPSS)

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 (2)

Apache — Traffic ServerDebian — Debian Linux

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2021-37148",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
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  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Traffic Server",
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  "published": "2021-11-03T16:15:08.043",
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  "descriptions": [
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      "lang": "en",
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    },
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      "lang": "es",
      "value": "Una vulnerabilidad de comprobación de entrada inapropiada en el análisis de encabezados de Apache Traffic Server permite a un atacante contrabandear peticiones. Este problema afecta a Apache Traffic Server versiones 8.0.0 a 8.1.2 y 9.0.0 a 9.0.1"
    }
  ],
  "lastModified": "2026-06-17T04:00:08.567",
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