CVE-2021-39275 (GCVE-0-2021-39275)

Vulnerability from cvelistv5 – Published: 2021-09-16 14:40 – Updated: 2024-08-04 02:06
VLAI
Title
ap_escape_quotes buffer overflow
Summary
ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier.
Severity
No CVSS data available.
CWE
  • Buffer Overflow
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1169 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache HTTP Server Affected: Apache HTTP Server 2.4 , ≤ 2.4.48 (custom)
guessed Create a notification for this product.
Credits
ClusterFuzz
Show details on NVD website
To clipboard 

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        "descriptions": [
          {
            "lang": "en",
            "value": "ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier."
          },
          {
            "lang": "es",
            "value": "la funci\u00f3n ap_escape_quotes() puede escribir m\u00e1s all\u00e1 del final de un buffer cuando se le da una entrada maliciosa. Ning\u00fan m\u00f3dulo incluido pasa datos no confiables a estas funciones, pero los m\u00f3dulos externos o de terceros pueden hacerlo. Este problema afecta a Apache HTTP Server versiones 2.4.48 y anteriores"
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        "id": "CVE-2021-39275",
        "lastModified": "2025-05-01T15:39:40.260",
        "metrics": {
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-09T01:14:13+00:00",
      "cve": "CVE-2021-39275",
      "id": "CVE-2021-39275",
      "initial_release_date": "2021-09-16T00:00:00+00:00",
      "product_status:fixed": "218",
      "product_status:known_affected": "13",
      "product_status:known_not_affected": "141",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "httpd: Out-of-bounds write in ap_escape_quotes() via malicious input",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-39275.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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