GHSA-84rm-qf37-fgc2 · Severity: medium · Ecosystem: rust — Integer Overflow in openssl-src
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).
Conclusion & alert: CVE-2021-23841 is rated Moderate Risk (61.4/100): CVSS Medium severity, with high exploitation likelihood (EPSS 7.47%, 94th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +6.51% over the last day, indicating growing attacker interest. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.96% | 7.47% | +6.51% |
| 2 | 2026-04-20 | 0.66% | 0.96% | +0.29% |
| 3 | 2026-03-18 | — | 0.66% | — |
Full EPSS history (38 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
GHSA-84rm-qf37-fgc2 · Severity: medium · Ecosystem: rust — Integer Overflow in openssl-src
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2021-23841: 3 source package rows (openssl, openssl1.1-compat, openssl3); 15 state rows across 13 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-community, edge-main); fixed 15, open 0. | https://security.alpinelinux.org/vuln/CVE-2021-23841 |
debian
|
not yet assigned | CVE-2021-23841 not yet assigned priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-23841 |
gentoo
|
normal | CVE-2021-23841: 1 GLSA(s) (202103-03), 1 atom(s) (dev-libs/openssl); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-23841 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-23841 |
suse
|
medium | CVE-2021-23841 severity moderate: SUSE including 606 source package names (0.1.0:libopenssl1_1-1.1.0i-14.15.1, 0.1.75:libopenssl1_1-1.1.0i-14.15.1, …), 1235 product×package rows across 267 product lines (Container bci/bci-init, Container bci/dotnet-aspnet, … (267 product lines)): Fixed 1041, Known Affected 135, Known Not Affected 59. | https://www.suse.com/security/cve/CVE-2021-23841/ |
ubuntu
|
medium | CVE-2021-23841 medium priority: Ubuntu including 4 source packages (edk2, nodejs, openssl, openssl1.0), 24 status rows across 6 suites (bionic, focal, groovy, trusty, upstream, xenial): not-affected 9, released 8, DNE 5, needs-triage 2. | https://ubuntu.com/security/CVE-2021-23841 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| openssl | openssl | >= 1.0.2, < 1.0.2y | cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* |
| openssl | openssl | >= 1.1.1, < 1.1.1j | cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| tenable | nessus_network_monitor | 5.11.0 | cpe:2.3:a:tenable:nessus_network_monitor:5.11.0:*:*:*:*:*:*:* |
| tenable | nessus_network_monitor | 5.11.1 | cpe:2.3:a:tenable:nessus_network_monitor:5.11.1:*:*:*:*:*:*:* |
| tenable | nessus_network_monitor | 5.12.0 | cpe:2.3:a:tenable:nessus_network_monitor:5.12.0:*:*:*:*:*:*:* |
| tenable | nessus_network_monitor | 5.12.1 | cpe:2.3:a:tenable:nessus_network_monitor:5.12.1:*:*:*:*:*:*:* |
| tenable | nessus_network_monitor | 5.13.0 | cpe:2.3:a:tenable:nessus_network_monitor:5.13.0:*:*:*:*:*:*:* |
| tenable | tenable.sc | >= 5.13.0, <= 5.17.0 | cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:* |
| apple | safari | < 14.1.1 | cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* |
| apple | ipados | < 14.6 | cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* |
| apple | iphone_os | < 14.6 | cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* |
| apple | macos | >= 11.1, < 11.4 | cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* |
| netapp | oncommand_insight | — | cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:* |
| netapp | oncommand_workflow_automation | — | cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:* |
| netapp | snapcenter | — | cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:* |
| oracle | business_intelligence | 5.5.0.0.0 | cpe:2.3:a:oracle:business_intelligence:5.5.0.0.0:*:*:*:enterprise:*:*:* |
| oracle | business_intelligence | 5.9.0.0.0 | cpe:2.3:a:oracle:business_intelligence:5.9.0.0.0:*:*:*:enterprise:*:*:* |
| oracle | business_intelligence | 12.2.1.3.0 | cpe:2.3:a:oracle:business_intelligence:12.2.1.3.0:*:*:*:enterprise:*:*:* |
| oracle | business_intelligence | 12.2.1.4.0 | cpe:2.3:a:oracle:business_intelligence:12.2.1.4.0:*:*:*:enterprise:*:*:* |
| oracle | communications_cloud_native_core_policy | 1.15.0 | cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.15.0:*:*:*:*:*:*:* |
| oracle | enterprise_manager_for_storage_management | 13.4.0.0 | cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.4.0.0:*:*:*:*:*:*:* |
| oracle | enterprise_manager_ops_center | 12.4.0.0 | cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:* |
| oracle | essbase | 21.2 | cpe:2.3:a:oracle:essbase:21.2:*:*:*:*:*:*:* |
| oracle | graalvm | 19.3.5 | cpe:2.3:a:oracle:graalvm:19.3.5:*:*:*:enterprise:*:*:* |
| oracle | graalvm | 20.3.1.2 | cpe:2.3:a:oracle:graalvm:20.3.1.2:*:*:*:enterprise:*:*:* |
| oracle | graalvm | 21.0.0.2 | cpe:2.3:a:oracle:graalvm:21.0.0.2:*:*:*:enterprise:*:*:* |
| oracle | jd_edwards_world_security | a9.4 | cpe:2.3:a:oracle:jd_edwards_world_security:a9.4:*:*:*:*:*:*:* |
| oracle | mysql_enterprise_monitor | < 8.0.23 | cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:* |
| oracle | mysql_server | < 5.7.33 | cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* |
| oracle | mysql_server | >= 8.0.15, < 8.0.23 | cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* |
| oracle | peoplesoft_enterprise_peopletools | 8.57 | cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:* |
| oracle | peoplesoft_enterprise_peopletools | 8.58 | cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:* |
| oracle | peoplesoft_enterprise_peopletools | 8.59 | cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:* |
| oracle | zfs_storage_appliance_kit | 8.8 | cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* |
| siemens | sinec_ins | < 1.0 | cpe:2.3:a:siemens:sinec_ins:*:*:*:*:*:*:*:* |
| siemens | sinec_ins | 1.0 | cpe:2.3:a:siemens:sinec_ins:1.0:-:*:*:*:*:*:* |
| siemens | sinec_ins | 1.0 | cpe:2.3:a:siemens:sinec_ins:1.0:sp1:*:*:*:*:*:* |