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Δ / VULNERABILITY RECORD

CVE-2021-3449.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSMEDIUM / 5.9CVSS 3.1 · nvd@nist.gov
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSModifiedModified Oct 08, 2026

Disclosure summary

An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).

Source-reported weakness categories

CWE-476

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

NIST National Vulnerability Database · NVD-CVE-2021-3449

Open original source · Updated Oct 08, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

VendorProduct / associationVersion / bounds
opensslopenssl* {"versionStartIncluding":"1.1.1","versionEndExcluding":"1.1.1k"}
debiandebian_linux9.0
debiandebian_linux10.0
freebsdfreebsd12.2
freebsdfreebsd12.2
freebsdfreebsd12.2
netappactive_iq_unified_manager-
netappcloud_volumes_ontap_mediator-
netappe-series_performance_analyzer-
netapponcommand_insight-
netapponcommand_workflow_automation-
netappontap_select_deploy_administration_utility-
netappsantricity_smi-s_provider-
netappsnapcenter-
netappstoragegrid-
tenablelog_correlation_engine* {"versionEndExcluding":"6.0.9"}
tenablenessus* {"versionEndIncluding":"8.13.1"}
tenablenessus_network_monitor5.11.0
tenablenessus_network_monitor5.11.1
tenablenessus_network_monitor5.12.0
tenablenessus_network_monitor5.12.1
tenablenessus_network_monitor5.13.0
tenabletenable.sc* {"versionStartIncluding":"5.13.0","versionEndIncluding":"5.17.0"}
fedoraprojectfedora34
mcafeeweb_gateway8.2.19
mcafeeweb_gateway9.2.10
mcafeeweb_gateway10.1.1
mcafeeweb_gateway_cloud_service8.2.19
mcafeeweb_gateway_cloud_service9.2.10
mcafeeweb_gateway_cloud_service10.1.1
checkpointquantum_security_management_firmwarer80.40
checkpointquantum_security_management_firmwarer81
checkpointmulti-domain_management_firmwarer80.40
checkpointmulti-domain_management_firmwarer81
checkpointquantum_security_gateway_firmwarer80.40
checkpointquantum_security_gateway_firmwarer81
oraclecommunications_communications_policy_management12.6.0.0.0
oracleenterprise_manager_for_storage_management13.4.0.0
oracleessbase21.2
oraclegraalvm19.3.5
oraclegraalvm20.3.1.2
oraclegraalvm21.0.0.2
oraclejd_edwards_enterpriseone_tools* {"versionEndExcluding":"9.2.6.0"}
oraclejd_edwards_world_securitya9.4
oraclemysql_connectors* {"versionEndIncluding":"8.0.23"}
oraclemysql_server* {"versionStartIncluding":"8.0.15","versionEndIncluding":"8.0.23"}
oraclemysql_workbench* {"versionEndIncluding":"8.0.23"}
oraclepeoplesoft_enterprise_peopletools8.57
oraclepeoplesoft_enterprise_peopletools8.58
oraclepeoplesoft_enterprise_peopletools8.59
oracleprimavera_unifier* {"versionStartIncluding":"17.7","versionEndIncluding":"17.12"}
oracleprimavera_unifier19.12
oracleprimavera_unifier20.12
oracleprimavera_unifier21.12
oraclesecure_backup* {"versionEndExcluding":"18.1.0.1.0"}
oraclesecure_global_desktop5.6
oraclezfs_storage_appliance_kit8.8
sonicwallsma100_firmware* {"versionStartIncluding":"10.2.0.0","versionEndExcluding":"10.2.1.0-17sv"}
sonicwallcapture_client3.5
sonicwallsonicos7.0.1.0
siemensruggedcom_rcm1224_firmware* {"versionStartIncluding":"6.2"}
siemensscalance_lpe9403_firmware*
siemensscalance_m-800_firmware* {"versionStartIncluding":"6.2"}
siemensscalance_s602_firmware* {"versionStartIncluding":"4.1"}
siemensscalance_s612_firmware* {"versionStartIncluding":"4.1"}
siemensscalance_s615_firmware* {"versionStartIncluding":"6.2"}
siemensscalance_s623_firmware* {"versionStartIncluding":"4.1"}
siemensscalance_s627-2m_firmware* {"versionStartIncluding":"4.1"}
siemensscalance_sc-600_firmware* {"versionStartIncluding":"2.0"}
siemensscalance_w700_firmware* {"versionStartIncluding":"6.5"}
siemensscalance_w1700_firmware* {"versionStartIncluding":"2.0"}
siemensscalance_xb-200_firmware* {"versionEndExcluding":"4.3"}
siemensscalance_xc-200_firmware* {"versionEndExcluding":"4.3"}
siemensscalance_xf-200ba_firmware* {"versionEndExcluding":"4.3"}
siemensscalance_xm-400_firmware* {"versionEndExcluding":"6.4"}
siemensscalance_xp-200_firmware* {"versionEndExcluding":"4.3"}
siemensscalance_xr-300wg_firmware* {"versionEndExcluding":"4.3"}
siemensscalance_xr524-8c_firmware* {"versionEndExcluding":"6.4"}
siemensscalance_xr526-8c_firmware* {"versionEndExcluding":"6.4"}
siemensscalance_xr528-6m_firmware* {"versionEndExcluding":"6.4"}
siemensscalance_xr552-12_firmware* {"versionEndExcluding":"6.4"}
siemenssimatic_cloud_connect_7_firmware* {"versionStartIncluding":"1.1"}
siemenssimatic_cloud_connect_7_firmware-
siemenssimatic_cp_1242-7_gprs_v2_firmware* {"versionStartIncluding":"3.1"}
siemenssimatic_cp_1242-7_gprs_v2_firmware-
siemenssimatic_hmi_basic_panels_2nd_generation_firmware*
siemenssimatic_hmi_comfort_outdoor_panels_firmware*
siemenssimatic_hmi_ktp_mobile_panels_firmware*
siemenssimatic_mv500_firmware*
siemenssimatic_net_cp_1243-1_firmware* {"versionStartIncluding":"3.1"}
siemenssimatic_net_cp1243-7_lte_eu_firmware* {"versionStartIncluding":"3.1"}
siemenssimatic_net_cp1243-7_lte_us_firmware* {"versionStartIncluding":"3.1"}
siemenssimatic_net_cp_1243-8_irc_firmware* {"versionStartIncluding":"3.1"}
siemenssimatic_net_cp_1542sp-1_irc_firmware* {"versionStartIncluding":"2.1"}
siemenssimatic_net_cp_1543-1_firmware* {"versionStartIncluding":"2.2","versionEndExcluding":"3.0"}
siemenssimatic_net_cp_1543sp-1_firmware* {"versionStartIncluding":"2.1"}
siemenssimatic_net_cp_1545-1_firmware* {"versionStartIncluding":"1.0"}
siemenssimatic_pcs_7_telecontrol_firmware*
siemenssimatic_pcs_neo_firmware*
siemenssimatic_pdm_firmware* {"versionStartIncluding":"9.1.0.7"}

Showing 100 associations; open the original for the complete set.

Original records & references

PUBLISHED 2021-03-25T11:15:13-04:00
MODIFIED 2026-10-08T18:17:11-04:00
INGESTED 2026-10-10T20:50:20-04:00