FKIE_CVE-2021-45444

Vulnerability from fkie_nvd - Published: 2022-02-14 12:15 - Updated: 2026-06-17 04:13
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
In zsh before 5.8.1, an attacker can achieve code execution if they control a command output inside the prompt, as demonstrated by a %F argument. This occurs because of recursive PROMPT_SUBST expansion.
References
cve@mitre.orghttp://seclists.org/fulldisclosure/2022/May/33Mailing List, Third Party Advisory
cve@mitre.orghttp://seclists.org/fulldisclosure/2022/May/35Mailing List, Third Party Advisory
cve@mitre.orghttp://seclists.org/fulldisclosure/2022/May/38Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2022/02/msg00020.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2P3LPMGENEHKDWFO4MWMZSZL6G7Y4CV7/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BWF3EXNBX5SVFDBL4ZFOD4GJBWFUKWN4/
cve@mitre.orghttps://support.apple.com/kb/HT213255Third Party Advisory
cve@mitre.orghttps://support.apple.com/kb/HT213256Third Party Advisory
cve@mitre.orghttps://support.apple.com/kb/HT213257Third Party Advisory
cve@mitre.orghttps://vuln.ryotak.me/advisories/63Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2022/dsa-5078Third Party Advisory
cve@mitre.orghttps://zsh.sourceforge.io/releases.htmlRelease Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2022/May/33Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2022/May/35Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2022/May/38Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/02/msg00020.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2P3LPMGENEHKDWFO4MWMZSZL6G7Y4CV7/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BWF3EXNBX5SVFDBL4ZFOD4GJBWFUKWN4/
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT213255Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT213256Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT213257Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://vuln.ryotak.me/advisories/63Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2022/dsa-5078Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://zsh.sourceforge.io/releases.htmlRelease Notes, Third Party Advisory
Impacted products
Vendor Product Version
zsh zsh *
fedoraproject fedora 34
fedoraproject fedora 35
debian debian_linux 9.0
debian debian_linux 10.0
debian debian_linux 11.0
apple mac_os_x *
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple mac_os_x 10.15.7
apple macos *
apple macos *
To clipboard 

{
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          "vendor": "n/a",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In zsh before 5.8.1, an attacker can achieve code execution if they control a command output inside the prompt, as demonstrated by a %F argument. This occurs because of recursive PROMPT_SUBST expansion."
    },
    {
      "lang": "es",
      "value": "En zsh versiones anteriores a 5.8.1, un atacante puede lograr una ejecuci\u00f3n de c\u00f3digo si controla la salida de un comando dentro del prompt, como lo demuestra un argumento %F. Esto ocurre debido a la expansi\u00f3n recursiva PROMPT_SUBST"
    }
  ],
  "id": "CVE-2021-45444",
  "lastModified": "2026-06-17T04:13:22.823",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "HIGH",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.1,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 4.9,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  },
  "published": "2022-02-14T12:15:15.750",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
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        "Third Party Advisory"
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      "url": "http://seclists.org/fulldisclosure/2022/May/33"
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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  ]
}



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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.