Vulnerability Database

383,304

Total vulnerabilities in the database

CVE-2021-3449 — openssl / openssl

NULL Pointer Dereference

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).

CVSS v3:

  • Severity: Medium
  • Score: 5.9
  • AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 4.3
  • AV:N/AC:M/Au:N/C:N/I:N/A:P

CWEs:

Software Affected versions
openssl / openssl >= 1.1.1, < 1.1.1k
tenable / log_correlation_engine < 6.0.9
oracle / jd_edwards_enterpriseone_tools < 9.2.6.0
oracle / secure_backup < 18.1.0.1.0
sonicwall / sma100_firmware >= 10.2.0.0, < 10.2.1.0-17sv
siemens / scalance_xb-200_firmware < 4.3
siemens / scalance_xc-200_firmware < 4.3
siemens / scalance_xf-200ba_firmware < 4.3
siemens / scalance_xm-400_firmware < 6.4
siemens / scalance_xp-200_firmware < 4.3
siemens / scalance_xr-300wg_firmware < 4.3
siemens / scalance_xr524-8c_firmware < 6.4
siemens / scalance_xr526-8c_firmware < 6.4
siemens / scalance_xr528-6m_firmware < 6.4
siemens / scalance_xr552-12_firmware < 6.4
siemens / simatic_net_cp_1543-1_firmware >= 2.2, < 3.0
siemens / tim_1531_irc_firmware >= 2.0, < 2.2
siemens / simatic_wincc_runtime_advanced All versions
siemens / tia_administrator All versions
siemens / sinumerik_opc_ua_server All versions
siemens / sinec_infrastructure_network_services < 1.0.1.1
nodejs / node.js >= 14.15.0, < 14.16.1
nodejs / node.js >= 12.13.0, < 12.22.1
nodejs / node.js >= 15.0.0, < 15.14.0
Rust icon openssl-src < 111.15.0
debian / debian_linux = 9.0
debian / debian_linux = 10.0
freebsd / freebsd = 12.2
freebsd / freebsd = 12.2-p1
freebsd / freebsd = 12.2-p2
tenable / nessus <= 8.13.1
tenable / nessus_network_monitor = 5.11.0
tenable / nessus_network_monitor = 5.11.1
tenable / nessus_network_monitor = 5.12.0
tenable / nessus_network_monitor = 5.12.1
tenable / nessus_network_monitor = 5.13.0
tenable / tenable.sc >= 5.13.0, <= 5.17.0
fedoraproject / fedora = 34
mcafee / web_gateway = 8.2.19
mcafee / web_gateway = 9.2.10
mcafee / web_gateway = 10.1.1
mcafee / web_gateway_cloud_service = 8.2.19
mcafee / web_gateway_cloud_service = 9.2.10
mcafee / web_gateway_cloud_service = 10.1.1
checkpoint / quantum_security_management_firmware = r80.40
checkpoint / quantum_security_management_firmware = r81
checkpoint / multi-domain_management_firmware = r80.40
checkpoint / multi-domain_management_firmware = r81
checkpoint / quantum_security_gateway_firmware = r80.40
checkpoint / quantum_security_gateway_firmware = r81
oracle / communications_communications_policy_management = 12.6.0.0.0
oracle / enterprise_manager_for_storage_management = 13.4.0.0
oracle / essbase = 21.2
oracle / graalvm = 19.3.5
oracle / graalvm = 20.3.1.2
oracle / graalvm = 21.0.0.2
oracle / jd_edwards_world_security = a9.4
oracle / mysql_connectors <= 8.0.23
oracle / mysql_server <= 5.7.33
oracle / mysql_server >= 8.0.15, <= 8.0.23
oracle / mysql_workbench <= 8.0.23
oracle / peoplesoft_enterprise_peopletools = 8.57
oracle / peoplesoft_enterprise_peopletools = 8.58
oracle / peoplesoft_enterprise_peopletools = 8.59
oracle / primavera_unifier >= 17.7, <= 17.12
oracle / primavera_unifier = 19.12
oracle / primavera_unifier = 20.12
oracle / primavera_unifier = 21.12
oracle / secure_global_desktop = 5.6
oracle / zfs_storage_appliance_kit = 8.8
sonicwall / capture_client = 3.5
sonicwall / sonicos = 7.0.1.0
siemens / ruggedcom_rcm1224_firmware >= 6.2
siemens / scalance_m-800_firmware >= 6.2
siemens / scalance_s602_firmware >= 4.1
siemens / scalance_s612_firmware >= 4.1
siemens / scalance_s615_firmware >= 6.2
siemens / scalance_s623_firmware >= 4.1
siemens / scalance_s627-2m_firmware >= 4.1
siemens / scalance_sc-600_firmware >= 2.0
siemens / scalance_w700_firmware >= 6.5
siemens / scalance_w1700_firmware >= 2.0
siemens / simatic_cloud_connect_7_firmware >= 1.1
siemens / simatic_cp_1242-7_gprs_v2_firmware >= 3.1
siemens / simatic_net_cp_1243-1_firmware >= 3.1
siemens / simatic_net_cp1243-7_lte_eu_firmware >= 3.1
siemens / simatic_net_cp1243-7_lte_us_firmware >= 3.1
siemens / simatic_net_cp_1243-8_irc_firmware >= 3.1
siemens / simatic_net_cp_1542sp-1_irc_firmware >= 2.1
siemens / simatic_net_cp_1543sp-1_firmware >= 2.1
siemens / simatic_net_cp_1545-1_firmware >= 1.0
siemens / simatic_pdm_firmware >= 9.1.0.7
siemens / simatic_process_historian_opc_ua_server_firmware >= 2019
siemens / simatic_logon >= 1.6.0.2
siemens / simatic_logon = 1.5-sp3_update_1
siemens / sinec_nms = 1.0
siemens / sinec_nms = 1.0-sp1
siemens / sinema_server = 14.0
siemens / sinema_server = 14.0-sp1
siemens / sinema_server = 14.0-sp2
siemens / sinema_server = 14.0-sp2_update1
siemens / sinema_server = 14.0-sp2_update2
nodejs / node.js >= 10.0.0, <= 10.12.0
nodejs / node.js >= 10.13.0, <= 10.24.0
nodejs / node.js >= 12.0.0, <= 12.12.0
nodejs / node.js >= 14.0.0, <= 14.14.0

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.