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CVE-2016-4554

Status: ModifiedHigh (8.6)—

mime_header.cc in Squid before 3.5.18 allows remote attackers to bypass intended same-origin restrictions and possibly conduct cache-poisoning attacks via a crafted HTTP Host header, aka a "header smuggling" issue.

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 (3)

Canonical — Ubuntu LinuxOracle — LinuxSquid-cache — Squid

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2016-4554",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
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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"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "NONE",
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        "exploitabilityScore": 3.9
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  "published": "2016-05-10T19:59:01.307",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
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      ]
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  "descriptions": [
    {
      "lang": "en",
      "value": "mime_header.cc in Squid before 3.5.18 allows remote attackers to bypass intended same-origin restrictions and possibly conduct cache-poisoning attacks via a crafted HTTP Host header, aka a \"header smuggling\" issue."
    },
    {
      "lang": "es",
      "value": "mime_header.cc en Squid en versiones anteriores a 3.5.18 permite a atacantes remotos eludir restricciones destinadas al mismo origen y posiblemente llevar a cabo ataques de envenenamiento de caché a través de una cabecera HTTP Host manipulada, también conocido como un problema \"contrabando de peticiones\"."
    }
  ],
  "lastModified": "2026-06-17T00:47:46.273",
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