Vulnerability Details : CVE-2021-23841
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
Vulnerability category: Denial of service
Products affected by CVE-2021-23841
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
- cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
- cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:business_intelligence:12.2.1.3.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:business_intelligence:12.2.1.4.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:business_intelligence:5.5.0.0.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:business_intelligence:5.9.0.0.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:jd_edwards_world_security:a9.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:graalvm:19.3.5:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:graalvm:20.3.1.2:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:graalvm:21.0.0.2:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.4.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.15.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:essbase:21.2:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:sinec_ins:*:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:sinec_ins:1.0:sp1:*:*:*:*:*:*
- cpe:2.3:a:siemens:sinec_ins:1.0:-:*:*:*:*:*:*
- cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
- cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*
- cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*
- cpe:2.3:a:tenable:nessus_network_monitor:5.11.0:*:*:*:*:*:*:*
- cpe:2.3:a:tenable:nessus_network_monitor:5.11.1:*:*:*:*:*:*:*
- cpe:2.3:a:tenable:nessus_network_monitor:5.12.0:*:*:*:*:*:*:*
- cpe:2.3:a:tenable:nessus_network_monitor:5.12.1:*:*:*:*:*:*:*
- cpe:2.3:a:tenable:nessus_network_monitor:5.13.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-23841
2.30%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 89 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-23841
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:N/A:P |
8.6
|
2.9
|
NIST | |
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
2.2
|
3.6
|
NIST |
CWE ids for CVE-2021-23841
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-23841
-
https://support.apple.com/kb/HT212534
About the security content of Safari 14.1.1 - Apple SupportThird Party Advisory
-
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807
git.openssl.org Git
-
https://www.oracle.com/security-alerts/cpuapr2022.html
Oracle Critical Patch Update Advisory - April 2022Patch;Third Party Advisory
-
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
Pulse Security Advisory: SA44846 - OpenSSL Security Advisory CVE-2021-23841Third Party Advisory
-
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=122a19ab48091c657f7cb1fb3af9fc07bd557bbf
git.openssl.org Git - openssl.git/commitdiffPatch;Vendor Advisory
-
https://security.netapp.com/advisory/ntap-20210219-0009/
February 2021 OpenSSL Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://www.oracle.com//security-alerts/cpujul2021.html
Oracle Critical Patch Update Advisory - July 2021Patch;Third Party Advisory
-
https://www.tenable.com/security/tns-2021-09
[R1] Nessus Network Monitor 5.13.1 Fixes Multiple Third-party Vulnerabilities - Security Advisory | Tenable®Third Party Advisory
-
https://support.apple.com/kb/HT212529
About the security content of macOS Big Sur 11.4 - Apple SupportThird Party Advisory
-
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c657f7cb1fb3af9fc07bd557bbf
git.openssl.org Git
-
https://www.oracle.com/security-alerts/cpuApr2021.html
Oracle Critical Patch Update Advisory - April 2021Patch;Third Party Advisory
-
https://www.tenable.com/security/tns-2021-03
[R1] Stand-alone Security Patches Available for Tenable.sc versions 5.13.0 to 5.17.0 - Security Advisory | Tenable®Third Party Advisory
-
https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
Patch;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20210513-0002/
April 2021 MySQL Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://security.netapp.com/advisory/ntap-20240621-0006/
February 2024 IBM Cognos Analytics Vulnerabilities in NetApp Products | NetApp Product Security
-
https://www.oracle.com/security-alerts/cpuoct2021.html
Oracle Critical Patch Update Advisory - October 2021Patch;Third Party Advisory
-
https://www.debian.org/security/2021/dsa-4855
Debian -- Security Information -- DSA-4855-1 opensslThird Party Advisory
-
http://seclists.org/fulldisclosure/2021/May/68
Full Disclosure: APPLE-SA-2021-05-25-5 Safari 14.1.1Mailing List;Third Party Advisory
-
https://www.openssl.org/news/secadv/20210216.txt
Vendor Advisory
-
http://seclists.org/fulldisclosure/2021/May/70
Full Disclosure: APPLE-SA-2021-05-25-2 macOS Big Sur 11.4Mailing List;Third Party Advisory
-
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807
git.openssl.org Git - openssl.git/commitdiffVendor Advisory
-
http://seclists.org/fulldisclosure/2021/May/67
Full Disclosure: APPLE-SA-2021-05-25-1 iOS 14.6 and iPadOS 14.6Mailing List;Third Party Advisory
-
https://security.gentoo.org/glsa/202103-03
OpenSSL: Multiple vulnerabilities (GLSA 202103-03) — Gentoo securityThird Party Advisory
-
https://support.apple.com/kb/HT212528
About the security content of iOS 14.6 and iPadOS 14.6 - Apple SupportThird Party Advisory
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