Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 3 |
CVE-ID | CVE-2023-43622 CVE-2023-45802 CVE-2023-31122 |
CWE-ID | CWE-399 CWE-125 |
Exploitation vector | Network |
Public exploit | Public exploit code for vulnerability #1 is available. |
Vulnerable software |
Citrix License Server Server applications / Application servers |
Vendor | Citrix |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
EUVDB-ID: #VU82247
Risk: Medium
CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]
CVE-ID: CVE-2023-43622
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper management of internal resources within the server when processing HTTP/2 connections with window size of 0. A remote attacker can exhaust available workers on the server and perform a denial of service (DoS) attack.
MitigationInstall update from vendor's website.
Vulnerable software versionsCitrix License Server: before 11.17.2.0 45000
CPE2.3 External linkshttps://support.citrix.com/article/CTX583758
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
EUVDB-ID: #VU82245
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2023-45802
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper management of internal resources within the server when handling HTTP/2 requests. A remote attacker can send multiple requests to the server and perform a denial of service (DoS) attack.
MitigationInstall update from vendor's website.
Vulnerable software versionsCitrix License Server: before 11.17.2.0 45000
CPE2.3 External linkshttps://support.citrix.com/article/CTX583758
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
EUVDB-ID: #VU82248
Risk: Medium
CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2023-31122
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary condition within mod_macro module. A remote attacker can send specially crafted requests to the server, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.
Install update from vendor's website.
Vulnerable software versionsCitrix License Server: before 11.17.2.0 45000
CPE2.3 External linkshttps://support.citrix.com/article/CTX583758
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.