CVE-2021-20718
Quick assessment
Affected
ZmartZone mod_auth_openidc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
ZmartZone IAM mod_auth_openidc是一款Apache HTTP服务器的身份验证/授权模块。 mod_auth_openidc 存在资源管理错误漏洞，该漏洞源于应用程序没有正确控制内部资源的消耗。远程攻击者可利用该漏洞可以触发资源耗尽并执行拒绝服务(DoS)攻击。以下产品及版本受到影响:mod auth openidc: 2.4.0、2.4.0.1、2.4.0.2、2.4.0.3、2.4.0.4、2.4.1、2.4.2、2.4.2.1、2.4.3、2.4.4、2.4.4.1、2.4
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-20718
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
mod_auth_openidc 2.4.0 to 2.4.7 allows a remote attacker to cause a denial-of-service (DoS) condition via unspecified vectors.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
mod_auth_openidc 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZmartZone IAM mod_auth_openidc是一款Apache HTTP服务器的身份验证/授权模块。 mod_auth_openidc 存在资源管理错误漏洞，该漏洞源于应用程序没有正确控制内部资源的消耗。远程攻击者可利用该漏洞可以触发资源耗尽并执行拒绝服务(DoS)攻击。以下产品及版本受到影响:mod auth openidc: 2.4.0、2.4.0.1、2.4.0.2、2.4.0.3、2.4.0.4、2.4.1、2.4.2、2.4.2.1、2.4.3、2.4.4、2.4.4.1、2.4
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| ZmartZone | mod_auth_openidc | 2.4.0 to 2.4.7 | - |
|
II. Public POCs for CVE-2021-20718
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-20718 (2)
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https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
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https://jvn.jp/en/jp/JVN49704918/index.html x_refsource_MISC
Mailing List Discussions for CVE-2021-20718 (2)
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5HJK366TLFEOIYWTHQSZO24MSDPBXHJU/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FV4KYMQWPS3I2QPW2C253MLIAFGBZPLK/ vendor-advisory x_refsource_FEDORA
Other References for CVE-2021-20718 (2)
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https://github.com/zmartzone/mod_auth_openidc x_refsource_MISC
-
https://www.zmartzone.eu/ x_refsource_MISC
IV. Related Vulnerabilities
Same product: mod_auth_openidc
-
CVE-2026-54789
mod_auth_openidc has out-of-bounds read and write in state c -
CVE-2025-31492
mod_auth_openidc allows OIDCProviderAuthRequestMethod POSTs -
CVE-2024-24814
Denial of service when manipulating mod_auth_openidc_session -
CVE-2023-28625
mod_auth_openidc core dump when OIDCStripCookies is set and -
CVE-2022-23527
Open Redirect in oidc_validate_redirect_url()
Same vendor: ZmartZone
-
CVE-2022-23527
Open Redirect in oidc_validate_redirect_url() -
CVE-2021-39191
URL Redirection to Untrusted Site ('Open Redirect') in mod_a -
CVE-2021-32792
XSS vulnerability when using OIDCPreservePost On in mod_auth -
CVE-2021-32791
Hardcoded static IV and AAD with a reused key in AES GCM enc -
CVE-2021-32786
Open Redirect in oidc_validate_redirect_url()
V. Comments for CVE-2021-20718
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