Vulnerability-Lookup

CNVD-2021-26204

Vulnerability from cnvd - Published: 2021-04-09

Title

GNU C Library拒绝服务漏洞（CNVD-2021-26204）

Description

GNU C Library (glibc)是一种按照LGPL许可协议发布的、开源、免费、方便从网络下载的C的编译程序。 GNU C Library 2.32及更早版本存在拒绝服务漏洞。该漏洞源于GNU C Library中的iconv函数在处理ISO-2022-JP-3编码的无效输入序列时会发生断言失败并中止程序。攻击者可利用该漏洞导致拒绝服务。

Severity

中

Patch Name

GNU C Library拒绝服务漏洞（CNVD-2021-26204）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://sourceware.org/bugzilla/show_bug.cgi?id=27256

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-3326

Impacted products

Name
Gnu GNU C Library <=2.32

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-3326",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-3326"
    }
  },
  "description": "GNU C Library (glibc)\u662f\u4e00\u79cd\u6309\u7167LGPL\u8bb8\u53ef\u534f\u8bae\u53d1\u5e03\u7684\u3001\u5f00\u6e90\u3001\u514d\u8d39\u3001\u65b9\u4fbf\u4ece\u7f51\u7edc\u4e0b\u8f7d\u7684C\u7684\u7f16\u8bd1\u7a0b\u5e8f\u3002\n\nGNU C Library 2.32\u53ca\u66f4\u65e9\u7248\u672c\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eGNU C Library\u4e2d\u7684iconv\u51fd\u6570\u5728\u5904\u7406ISO-2022-JP-3\u7f16\u7801\u7684\u65e0\u6548\u8f93\u5165\u5e8f\u5217\u65f6\u4f1a\u53d1\u751f\u65ad\u8a00\u5931\u8d25\u5e76\u4e2d\u6b62\u7a0b\u5e8f\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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://sourceware.org/bugzilla/show_bug.cgi?id=27256",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-26204",
  "openTime": "2021-04-09",
  "patchDescription": "GNU C Library (glibc)\u662f\u4e00\u79cd\u6309\u7167LGPL\u8bb8\u53ef\u534f\u8bae\u53d1\u5e03\u7684\u3001\u5f00\u6e90\u3001\u514d\u8d39\u3001\u65b9\u4fbf\u4ece\u7f51\u7edc\u4e0b\u8f7d\u7684C\u7684\u7f16\u8bd1\u7a0b\u5e8f\u3002\r\n\r\nGNU C Library 2.32\u53ca\u66f4\u65e9\u7248\u672c\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eGNU C Library\u4e2d\u7684iconv\u51fd\u6570\u5728\u5904\u7406ISO-2022-JP-3\u7f16\u7801\u7684\u65e0\u6548\u8f93\u5165\u5e8f\u5217\u65f6\u4f1a\u53d1\u751f\u65ad\u8a00\u5931\u8d25\u5e76\u4e2d\u6b62\u7a0b\u5e8f\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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": "GNU C Library\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2021-26204\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Gnu GNU C Library \u003c=2.32"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-3326",
  "serverity": "\u4e2d",
  "submitTime": "2021-01-28",
  "title": "GNU C Library\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2021-26204\uff09"
}

CVE-2021-3326 (GCVE-0-2021-3326)

Vulnerability from cvelistv5 – Published: 2021-01-27 00:00 – Updated: 2025-06-09 15:18

Summary

The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid input sequences in the ISO-2022-JP-3 encoding, fails an assertion in the code path and aborts the program, potentially resulting in a denial of service.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-09 15:17 UTC

CWE

n/a
CWE-617 - Reachable Assertion

Assigner

mitre mitre root

References

8 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=27256
https://sourceware.org/git/?p=glibc.git%3Ba=commi…
http://www.openwall.com/lists/oss-security/2021/01/28/2	mailing-list
https://security.gentoo.org/glsa/202107-07	vendor-advisory
https://www.oracle.com/security-alerts/cpujan2022.html
https://security.netapp.com/advisory/ntap-2021030…
https://www.oracle.com/security-alerts/cpuapr2022.html
https://lists.debian.org/debian-lts-announce/2022…	mailing-list

Show details on NVD website

JSON

To clipboard

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        "providerMetadata": {
          "dateUpdated": "2024-08-03T16:53:17.469Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=27256"
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            "url": "https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=7d88c6142c6efc160c0ee5e4f85cde382c072888"
          },
          {
            "name": "[oss-security] 20210128 Re: glibc iconv crash with ISO-2022-JP-3",
            "tags": [
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              "x_transferred"
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            "url": "http://www.openwall.com/lists/oss-security/2021/01/28/2"
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            "tags": [
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            "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
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            "url": "https://security.netapp.com/advisory/ntap-20210304-0007/"
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            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
          },
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            "tags": [
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              "x_transferred"
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            "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html"
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        ],
        "title": "CVE Program Container"
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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
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                "id": "CVE-2021-3326",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-09T15:17:18.701250Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "problemTypes": [
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          "tags": [
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    "state": "PUBLISHED"
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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.

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.

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Action not permitted

CNVD-2021-26204

CVE-2021-3326 (GCVE-0-2021-3326)

Tags

Sightings

Nomenclature

Related by attack behaviour