CVE-2021-44228

Published Dec 10, 2021

Last updated 2 months ago

Exploit knownCVSS critical 10.0
Log4Shell
Docker
sca
VDI
hsm
Sonicwall
web application
Cloud
Network
Zero-day
Open source
API
ICS
IoT
Supply chain
Server
SMTP
Port (80)
Port (443)

Overview

Description
Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.
Source
security@apache.org
NVD status
Analyzed
Products
6bk1602-0aa12-0tp0_firmware, 6bk1602-0aa22-0tp0_firmware, 6bk1602-0aa32-0tp0_firmware, 6bk1602-0aa42-0tp0_firmware, 6bk1602-0aa52-0tp0_firmware, log4j, sppa-t3000_ses3000_firmware, capital, comos, desigo_cc_advanced_reports, desigo_cc_info_center, e-car_operation_center, energy_engage, energyip, energyip_prepay, gma-manager, head-end_system_universal_device_integration_system, industrial_edge_management, industrial_edge_management_hub, logo\!_soft_comfort, mendix, mindsphere, navigator, nx, opcenter_intelligence, operation_scheduler, sentron_powermanager, siguard_dsa, sipass_integrated, siveillance_command, siveillance_control_pro, siveillance_identity, siveillance_vantage, siveillance_viewpoint, solid_edge_cam_pro, solid_edge_harness_design, spectrum_power_4, spectrum_power_7, teamcenter, vesys, xpedition_enterprise, xpedition_package_integrator, computer_vision_annotation_tool, datacenter_manager, genomics_kernel_library, oneapi_sample_browser, secure_device_onboard, system_studio, debian_linux, fedora, email_security, active_iq_unified_manager, brocade_san_navigator, cloud_insights, cloud_manager, cloud_secure_agent, oncommand_insight, ontap_tools, snapcenter, solidfire_\&_hci_storage_node, solidfire_enterprise_sds, advanced_malware_protection_virtual_private_cloud_appliance, automated_subsea_tuning, broadworks, business_process_automation, cloud_connect, cloudcenter, cloudcenter_cost_optimizer, cloudcenter_suite_admin, cloudcenter_workload_manager, common_services_platform_collector, connected_mobile_experiences, contact_center_domain_manager, contact_center_management_portal, crosswork_data_gateway, crosswork_network_controller, crosswork_optimization_engine, crosswork_platform_infrastructure, crosswork_zero_touch_provisioning, customer_experience_cloud_agent, cyber_vision_sensor_management_extension, data_center_network_manager, dna_center, dna_spaces\, emergency_responder, enterprise_chat_and_email, evolved_programmable_network_manager, finesse, fog_director, identity_services_engine, integrated_management_controller_supervisor, intersight_virtual_appliance, iot_operations_dashboard, network_assurance_engine, network_services_orchestrator, nexus_dashboard, nexus_insights, optical_network_controller, packaged_contact_center_enterprise, paging_server, prime_service_catalog, sd-wan_vmanage, smart_phy, ucs_central, ucs_director, unified_communications_manager, unified_communications_manager_im_and_presence_service, unified_contact_center_enterprise, unified_contact_center_express, unified_customer_voice_portal, unified_intelligence_center, unity_connection, video_surveillance_operations_manager, virtual_topology_system, virtualized_infrastructure_manager, virtualized_voice_browser, wan_automation_engine, webex_meetings_server, workload_optimization_manager, unified_sip_proxy, unified_workforce_optimization, fxos, cloudcenter_suite, crosswork_network_automation, cx_cloud_agent, cyber_vision, dna_spaces, dna_spaces_connector, mobility_services_engine, network_dashboard_fabric_controller, network_insights_for_data_center, secure_firewall_threat_defense, ucs_central_software, unified_communications_manager_im_\&_presence_service, unified_computing_system, unified_contact_center_management_portal, video_surveillance_manager, snow_commander, vm_access_proxy, synchro, synchro_4d, rhythmyx, xcode

Insights

Analysis from the Intruder Security Team
Published Oct 15, 2024

Log4j is a remote code execution vulnerability, in the popular log4j package, which is everywhere.

More information is available in our blog post here.

Risk scores

CVSS 3.1

Type
Primary
Base score
10
Impact score
6
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Severity
CRITICAL

CVSS 2.0

Type
Primary
Base score
9.3
Impact score
10
Exploitability score
8.6
Vector string
AV:N/AC:M/Au:N/C:C/I:C/A:C

Known exploits

Data from CISA

Vulnerability name
Apache Log4j2 Remote Code Execution Vulnerability
Exploit added on
Dec 10, 2021
Exploit action due
Dec 24, 2021
Required action
For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.

Weaknesses

security@apache.org
CWE-20
nvd@nist.gov
CWE-917

Social media

Hype score
Not currently trending
  1. ExploitGrid Daily Digest 🚨 Top Exploits: CVE-2021-44228 (CVSS: 10) Apache Softw... CVE-2023-20198 (CVSS: 10) Cisco CVE-2024-3400 (CVSS: 10) paloaltonetw... CVE-2025-55182 (CVSS: 10) Meta CVE-2024-12603 (CVSS: 9.8) TECNO ..🧵👇

    @exploitgrid

    21 Oct 2026

    64 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    1 Reply

    0 Quotes

  2. 🚨 机器人 安全警报|NAS 和录像机被劫持当“住宅代理” GreyNoise:34 个国家至少 143 台设备的网络带宽被攻击者偷偷转卖。根因是暴露在公网的 D-Link ShareCenter NAS、Ubiquiti UniFi Video 录像机等设备一直没修补已知漏

    @fenzlabs

    15 Oct 2026

    149 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  3. ExploitGrid Daily Digest 🚨 Top Exploits: CVE-2026-94503 (CVSS: 10) PX-lab CVE-2021-44228 (CVSS: 10) Apache Softw... CVE-2026-84411 (CVSS: 9.8) mikrotik CVE-2026-84520 (CVSS: 9.8) apple CVE-2026-85097 (CVSS: 9.8) bricksforge ..🧵👇

    @exploitgrid

    12 Oct 2026

    421 Impressions

    0 Retweets

    11 Likes

    0 Bookmarks

    2 Replies

    0 Quotes

  4. Diese Woche: Alle Schwachstellen im KEV-Katalog sind kritisch. CVE-2021-44228 (Apache), CVE-2026-10520 (Ivanti), CVE-2020-0796 (Microsoft), CVE-2025-55182 (Meta), CVE-2025-10035 (Fortra) haben CVSS 10.0 und hohe EPSS. Priorisieren Sie nach Ihrem Bestand. #Ivanti #ThreatIntel

    @BytesNora

    12 Oct 2026

    2 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  5. 好きな脆弱性発表ドラゴンが 好きな脆弱性を発表します CVE-2017-0144 CVE-2021-44228 CVE-2023-4863 CVE-2026-31431 正式名称がわからない脆弱性も 好き 好き 大好き

    @zeki_studydiary

    1 Oct 2026

    22 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  6. #ExploitGrid Daily Digest 🚨 Top Exploits: CVE-2021-44228 (CVSS: 10) #Apache Softw... CVE-2021-44228 (CVSS: 10) Apache Softw... CVE-2025-32433 (CVSS: 10) erlang CVE-2026-100382 (CVSS: 10) Wikimedia Fo... CVE-2026-97163 (CVSS: 10) https://t.co/nLrUJVUfAX ..🧵👇

    @exploitgrid

    29 Sept 2026

    512 Impressions

    0 Retweets

    3 Likes

    1 Bookmark

    1 Reply

    0 Quotes

  7. 🛡️ #ExploitGrid Daily #Threat Digest Critical Exploits disclosed today: CVE-2021-44228 CVE-2021-44228 CVE-2025-32433 CVE-2026-100382 CVE-2026-97163 ..🧵👇

    @exploitgrid

    28 Sept 2026

    89 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    1 Reply

    0 Quotes

  8. All these KEV entries are exploited. CVE-2021-44228 (Apache), CVE-2026-10520 (Ivanti), CVE-2020-0796 (Microsoft), CVE-2025-55182 (Meta), CVE-2025-10035 (Fortra) all have CVSS 10.0 and EPSS >99%. Prioritize based on your asset inventory. #Ivanti #ThreatIntel #CyberSecurity

    @BytesNora

    28 Sept 2026

    3 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  9. All these KEV-cataloged vulns are exploited. CVE-2021-44228 (Apache), CVE-2026-10520 (Ivanti), CVE-2025-32432 (Craft CMS), CVE-2020-0796 (Microsoft), CVE-2025-55182 (Meta) all have CVSS 10.0, EPSS 100%, SecBoard Risk 85. Prioritize based on your assets. #Ivanti #ThreatIntel

    @BytesNora

    21 Sept 2026

    9 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  10. 🛡️ #ExploitGrid Daily Threat Digest Critical Exploits disclosed today: CVE-2021-44228 CVE-2025-24813 CVE-2025-32433 CVE-2026-32604 CVE-2024-30804 ..🧵👇

    @exploitgrid

    19 Sept 2026

    48 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    1 Reply

    0 Quotes

  11. All 5 KEV-listed vulns this week are critical (CVSS 10.0, EPSS 100%). But not all deserve equal urgency. CVE-2021-44228 (Apache), CVE-2026-10520 (Ivanti), CVE-2025-32432 (Craft CMS), CVE-2020-0796 (Microsoft), CVE-2025-55182 (Meta). Prioritize based on your asset inventory.

    @BytesNora

    14 Sept 2026

    5 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  12. This week's KEV additions: CVE-2021-44228 (Apache), CVE-2026-10520 (Ivanti), CVE-2025-32432 (Craft CMS), CVE-2020-0796 (Microsoft), CVE-2025-55182 (Meta). All are actively exploited. Prioritize based on your asset inventory, not just CVSS 10.0 scores.

    @BytesNora

    7 Sept 2026

    6 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  13. 🚨High - Amazon Linux log4j hotpatch Root Command Injection via Newline Path (CVE-2026-85656) Amazon Linux log4j-cve-2021-44228-hotpatch < 1.3-9.amzn2 mishandles Java executable paths containing embedded newline characters, enabling OS command injection during hotpatch hand

    @UpwindMDR

    5 Sept 2026

    210 Impressions

    0 Retweets

    1 Like

    0 Bookmarks

    0 Replies

    0 Quotes

  14. 🛡️ #ExploitGrid Daily #Threat Digest Critical Exploits disclosed today: CVE-2021-44228 CVE-2023-46604 CVE-2024-39700 CVE-2025-39401 CVE-2026-0768 ..🧵👇

    @exploitgrid

    3 Sept 2026

    32 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    1 Reply

    0 Quotes

  15. 🛡️ #ExploitGrid Daily #Threat Digest Critical Exploits disclosed today: EGE-GH-gXcrY61 ( CVE-2021-44228 ) EGE-GH-mlHKBE9 ( CVE-2021-44228 ) EGE-GH-UkC3bPM ( CVE-2026-57827 ) EGE-GH-kQvdrdy ( CVE-2021-21972 ) EGE-GH-UzPcxEL ( CVE-2023-33246 ) ..🧵👇

    @exploitgrid

    4 Aug 2026

    35 Impressions

    1 Retweet

    1 Like

    0 Bookmarks

    1 Reply

    0 Quotes

  16. 🛡️ #ExploitGrid Daily #Threat Digest Critical Exploits disclosed today: #EGE-GH-2hTfkzq ( CVE-2026-57827 ) EGE-GH-p5IA4H4 ( CVE-2026-57811 ) EGE-GH-uLGqWw2 ( CVE-2018-4013 ) EGE-GH-H7DtJPV ( CVE-2018-4013 ) EGE-GH-arkHFzA ( CVE-2021-44228 ) ..🧵👇

    @exploitgrid

    31 Jul 2026

    40 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    1 Reply

    0 Quotes

  17. Log4j (CVE-2021-44228) is still being exploited in 2025. Four years after disclosure, unpatched systems remain active targets. Legacy vulnerabilities with easy exploitation never stop being targeted. Patch everything. #Log4j #LegacyVulns

    @theGreyHatter

    29 Jun 2026

    24 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  18. CVE-2021-44228 patch rates hit 93% within 90 days. Looks good. The 7% remainder is your internet-facing Log4j in a forgotten vendor appliance nobody owns. That's where shells still live in 2025. https://t.co/IOmgnVFkBG

    @paul_fregonese

    9 Jun 2026

    27 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  19. نسخه جدید باج افزار DragonForce منتشر شده است که از آسیب پذیری هایی با کدهای شناسایی CVE-2021-44228 و CVE-2023-46805 و CVE-2024-21887 استفاده می کند. برای حفظ دسترسی خود از بدافزاری

    @AmirHossein_sec

    10 May 2025

    80 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

Configurations

References

Sources include official advisories and independent security research.