GreyNoise has confirmed active exploitation of 23 out of 62 vulnerabilities referenced in internal chat logs attributed to the Black Basta ransomware group.

These vulnerabilities span enterprise software, security appliances, and widely deployed web applications, with several critical flaws exploited as recently as the past 24 hours.

The findings underscore the persistent targeting of known vulnerabilities, even those absent from government advisories like CISA’s Known Exploited Vulnerabilities (KEV) catalog.

The leaked logs, initially compiled by cybersecurity firm VulnCheck, provided a rare window into the vulnerabilities prioritized by ransomware operators.

List of CVEs in chat logs (Compiled by Vulncheck)

Actively Exploited vulnerabilities:

CVE ID	Description	Vendor/Product	Exploitation Status
CVE-2024-3400	PAN-OS Command Injection	Palo Alto Networks	Active (Last 24h)
CVE-2024-27198	JetBrains TeamCity Authentication Bypass	JetBrains	Active (Last 24h)
CVE-2024-24919	Check Point Quantum Security Gateways Info Disclosure	Check Point	Active (Last 24h)
CVE-2024-23897	Jenkins CLI Path Traversal	Jenkins	Confirmed Active
CVE-2024-1709	ConnectWise ScreenConnect Auth Bypass	ConnectWise	Active (Last 24h)
CVE-2023-6875	WordPress Post SMTP Mailer Missing Authorization	WPExperts	Active (Not in KEV)
CVE-2023-4966	Citrix NetScaler ADC Buffer Overflow (Citrix Bleed)	Citrix	Active (Last 24h)
CVE-2023-42793	JetBrains TeamCity Auth Bypass	JetBrains	Confirmed Active
CVE-2023-36845	Juniper Junos OS PHP Variable Control	Juniper	Active (Last 24h)
CVE-2023-36844	Juniper Junos EX PHP Variable Modification	Juniper	Confirmed Active
CVE-2023-29357	Microsoft SharePoint Privilege Escalation	Microsoft	Confirmed Active
CVE-2023-22515	Atlassian Confluence Access Control Bypass	Atlassian	Active (Last 24h)
CVE-2023-20198	Cisco IOS XE Web UI Privilege Escalation	Cisco	Active (Last 24h)
CVE-2022-41082	Microsoft Exchange Remote Code Execution	Microsoft	Active (Last 24h)
CVE-2022-41040	Microsoft Exchange Server-Side Request Forgery	Microsoft	Confirmed Active
CVE-2022-37042	Zimbra Collaboration Suite Auth Bypass	Synacor	Confirmed Active
CVE-2022-30525	Zyxel Firewall OS Command Injection	Zyxel	Active (Last 24h)
CVE-2022-27925	Zimbra Arbitrary File Upload	Synacor	Confirmed Active
CVE-2022-26134	Atlassian Confluence Remote Code Execution	Atlassian	Confirmed Active
CVE-2022-22965	Spring Framework RCE (Spring4Shell)	VMware	Confirmed Active
CVE-2022-1388	F5 BIG-IP Missing Authentication	F5 Networks	Confirmed Active
CVE-2021-44228	Apache Log4j RCE (Log4Shell)	Apache	Active (Last 24h)
CVE-2021-26855	Microsoft Exchange RCE (ProxyLogon)	Microsoft	Active (Last 24h)

Recent Surge in Zero-Day Exploitation

GreyNoise’s internet-wide telemetry identified exploitation activity for 23 CVEs, including high-severity flaws in Palo Alto Networks PAN-OS, Cisco IOS XE, and Microsoft Exchange Server. Notably, CVE-2023-6875, a missing authorization vulnerability in the WordPress plugin “Post SMTP Mailer,” has seen exploitation despite lacking KEV designation, highlighting the limitations of static vulnerability lists.

The operational tempo of attackers remains alarming, with 12 CVEs exploited within the past 24 hours alone. These include:

CVE-2024-3400 (Palo Alto PAN-OS command injection)
CVE-2024-27198 (JetBrains TeamCity authentication bypass)
CVE-2023-20198 (Cisco IOS XE privilege escalation)
CVE-2022-41082 (Microsoft Exchange Remote Code Execution)

Network appliances from Palo Alto, Cisco, and Juniper dominate the exploited vulnerabilities list. CVE-2024-3400, a command injection flaw in Palo Alto’s PAN-OS, enables unauthenticated attackers to execute arbitrary code with root privileges. Similarly, CVE-2023-20198 in Cisco IOS XE’s web UI has resurfaced as a prime target, allowing attackers to create privileged accounts and deploy malicious implants.

Juniper’s Junos OS vulnerabilities (CVE-2023-36845 and CVE-2023-36844) continue to be exploited through PHP variable manipulation, enabling remote code execution on EX Series switches. These attacks often precede lateral movement attempts within corporate networks.

High-traffic web platforms remain vulnerable, with CVE-2023-22515 (Atlassian Confluence access control bypass) and CVE-2022-26134 (Confluence Server remote code execution) actively exploited. Microsoft Exchange Server vulnerabilities CVE-2021-26855 (ProxyLogon) and CVE-2022-41082 persist in attacker playbooks, enabling mailbox infiltration and server compromise.

The reappearance of CVE-2021-44228 (Log4Shell) in exploitation attempts underscores the challenge of eradicating this ubiquitous logging library vulnerability.

GreyNoise observed renewed scanning for Log4j instances, particularly in unpatched IoT and enterprise systems.

GreyNoise’s 24-hour activity snapshot reveals intensified targeting of:

CVE-2024-24919: Check Point Quantum Security Gateways information disclosure
CVE-2023-4966: Citrix NetScaler ADC buffer overflow (Citrix Bleed)
CVE-2022-30525: Zyxel firewall OS command injection

These exploits frequently precede ransomware deployment, with attackers leveraging initial access to disable security tools and exfiltrate data. The ConnectWise ScreenConnect flaw (CVE-2024-1709) has become particularly prevalent, with attackers exploiting authentication bypasses to implant remote access trojans.

While patching remains critical, the absence of CVE-2023-6875 from the KEV catalog demonstrates the need for real-time threat intelligence. GreyNoise recommends:

Network Segmentation: Isolate internet-facing systems like Exchange servers and VPN gateways.
Behavioral Monitoring: Detect anomalous process creation and suspicious authentication patterns.
Compromise Assessments: Hunt for indicators of exploitation across the 23 CVEs using IoCs from GreyNoise’s dataset.

With ransomware groups increasingly automating vulnerability exploitation, continuous monitoring, and infrastructure hardening have become non-negotiable components of modern cybersecurity programs.

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The post 23 Vulnerabilities in Black Basta’s Chat Logs Exploited in the Wild, Including PAN-OS, Cisco IOS, & Exchange appeared first on Cyber Security News.