Vulnerability-Lookup

CNVD-2020-21802

Vulnerability from cnvd - Published: 2020-04-08

Title

Mozilla Firefox和Firefox ESR内存错误引用漏洞（CNVD-2020-21802）

Description

Mozilla Firefox（火狐）是一个自由的、开放源码的浏览器，适用于Windows、Linux及MacOSX平台。Firefox ESR是指火狐浏览器延长支持版，是mozilla专门为无法或不愿每隔六周就升级一次的企业所打造。 Mozilla Firefox和Firefox ESR存在内存错误引用漏洞。目前没有详细的漏洞细节提供。

Severity

高

Patch Name

Mozilla Firefox和Firefox ESR内存错误引用漏洞（CNVD-2020-21802）的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/

Reference

https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/

Impacted products

Name
['Mozilla Firefox <74.0.1', 'Mozilla Firefox ESR <68.6.1']

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-6820",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-6820"
    }
  },
  "description": "Mozilla Firefox\uff08\u706b\u72d0\uff09\u662f\u4e00\u4e2a\u81ea\u7531\u7684\u3001\u5f00\u653e\u6e90\u7801\u7684\u6d4f\u89c8\u5668\uff0c\u9002\u7528\u4e8eWindows\u3001Linux\u53caMacOSX\u5e73\u53f0\u3002Firefox ESR\u662f\u6307\u706b\u72d0\u6d4f\u89c8\u5668\u5ef6\u957f\u652f\u6301\u7248\uff0c\u662fmozilla\u4e13\u95e8\u4e3a\u65e0\u6cd5\u6216\u4e0d\u613f\u6bcf\u9694\u516d\u5468\u5c31\u5347\u7ea7\u4e00\u6b21\u7684\u4f01\u4e1a\u6240\u6253\u9020\u3002\n\nMozilla Firefox\u548cFirefox ESR\u5b58\u5728\u5185\u5b58\u9519\u8bef\u5f15\u7528\u6f0f\u6d1e\u3002\u76ee\u524d\u6ca1\u6709\u8be6\u7ec6\u7684\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2020-11/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-21802",
  "openTime": "2020-04-08",
  "patchDescription": "Mozilla Firefox\uff08\u706b\u72d0\uff09\u662f\u4e00\u4e2a\u81ea\u7531\u7684\u3001\u5f00\u653e\u6e90\u7801\u7684\u6d4f\u89c8\u5668\uff0c\u9002\u7528\u4e8eWindows\u3001Linux\u53caMacOSX\u5e73\u53f0\u3002Firefox ESR\u662f\u6307\u706b\u72d0\u6d4f\u89c8\u5668\u5ef6\u957f\u652f\u6301\u7248\uff0c\u662fmozilla\u4e13\u95e8\u4e3a\u65e0\u6cd5\u6216\u4e0d\u613f\u6bcf\u9694\u516d\u5468\u5c31\u5347\u7ea7\u4e00\u6b21\u7684\u4f01\u4e1a\u6240\u6253\u9020\u3002\r\n\r\nMozilla Firefox\u548cFirefox ESR\u5b58\u5728\u5185\u5b58\u9519\u8bef\u5f15\u7528\u6f0f\u6d1e\u3002\u76ee\u524d\u6ca1\u6709\u8be6\u7ec6\u7684\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Mozilla Firefox\u548cFirefox ESR\u5185\u5b58\u9519\u8bef\u5f15\u7528\u6f0f\u6d1e\uff08CNVD-2020-21802\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Mozilla Firefox \u003c74.0.1",
      "Mozilla Firefox ESR \u003c68.6.1"
    ]
  },
  "referenceLink": "https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/",
  "serverity": "\u9ad8",
  "submitTime": "2020-04-07",
  "title": "Mozilla Firefox\u548cFirefox ESR\u5185\u5b58\u9519\u8bef\u5f15\u7528\u6f0f\u6d1e\uff08CNVD-2020-21802\uff09"
}

CVE-2020-6820 (GCVE-0-2020-6820)

Vulnerability from cvelistv5 – Published: 2020-04-24 15:56 – Updated: 2025-10-21 23:35

Summary

Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-07 12:49 UTC

CWE

Use-after-free when handling a ReadableStream
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

mozilla mitre root

References

5 references

URL	Tags
https://www.mozilla.org/security/advisories/mfsa2…	x_refsource_MISC
https://www.mozilla.org/security/advisories/mfsa2…	x_refsource_MISC
https://bugzilla.mozilla.org/show_bug.cgi?id=1626728	x_refsource_MISC
https://usn.ubuntu.com/4335-1/	vendor-advisoryx_refsource_UBUNTU
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

3 products

Vendor	Product	Version
Mozilla	Thunderbird	Affected: unspecified , < 68.7.0 (custom)
Mozilla	Firefox	Affected: unspecified , < 74.0.1 (custom)
Mozilla	Firefox ESR	Affected: unspecified , < 68.6.1 (custom)

Show details on NVD website

JSON

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              "confidentialityImpact": "HIGH",
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}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.