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CVE-2025-59089— Python-kdcproxy: remote dos via unbounded tcp upstream buffering

Quick assessment

Affected
latchset kdcproxy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

kdcproxy是latchset开源的一个Python库 kdcproxy存在安全漏洞，该漏洞源于未强制执行TCP响应长度边界，可能导致拒绝服务攻击。

CVSS 5.9 · Medium EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 19

VendorProduct Version RangeStatus
latchset kdcproxy < 1.1.0 affected
Red Hat Red Hat Enterprise Linux 10 0:1.0.0-19.el10_1< * unaffected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.0.0-19.el10_0< * unaffected
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:0.3.2-3.el7_9.3< * unaffected
Red Hat Red Hat Enterprise Linux 8 8100020251103113748.143e9e98< * unaffected
8100020251028161822.823393f5< * unaffected
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020251106022345.792f4060< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020251103205102.5b01ab7e< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020251103205102.5b01ab7e< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020251030180424.ada582f1< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 8060020251030180424.ada582f1< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 8060020251030180424.ada582f1< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020251029082621.b0a6ceea< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020251029082621.b0a6ceea< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:1.0.0-9.el9_7< * unaffected
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:1.0.0-7.el9_0.1< * unaffected
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.0.0-7.el9_2.1< * unaffected
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:1.0.0-7.el9_4.1< * unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.0.0-9.el9_6< * unaffected
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I. Basic Information for CVE-2025-59089

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Python-kdcproxy: remote dos via unbounded tcp upstream buffering
Source: CVE Program / CVE List V5
Vulnerability Description
If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g. through server-side request forgery), they can exploit the fact that kdcproxy does not enforce bounds on TCP response length to conduct a denial-of-service attack. While receiving the KDC's response, kdcproxy copies the entire buffered stream into a new buffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response header, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
kdcproxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kdcproxy是latchset开源的一个Python库 kdcproxy存在安全漏洞，该漏洞源于未强制执行TCP响应长度边界，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
latchset kdcproxy 0 ~ 1.1.0 -
Red Hat Red Hat Enterprise Linux 10 0:1.0.0-19.el10_1 ~ * cpe:/o:redhat:enterprise_linux:10.1
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.0.0-19.el10_0 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:0.3.2-3.el7_9.3 ~ * cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 8100020251103113748.143e9e98 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8 8100020251028161822.823393f5 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020251106022345.792f4060 ~ * cpe:/a:redhat:rhel_aus:8.2::appstream
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020251103205102.5b01ab7e ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020251103205102.5b01ab7e ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020251030180424.ada582f1 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 8060020251030180424.ada582f1 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 8060020251030180424.ada582f1 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020251029082621.b0a6ceea ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020251029082621.b0a6ceea ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:1.0.0-9.el9_7 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:1.0.0-7.el9_0.1 ~ * cpe:/a:redhat:rhel_e4s:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.0.0-7.el9_2.1 ~ * cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:1.0.0-7.el9_4.1 ~ * cpe:/a:redhat:rhel_eus:9.4::appstream
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.0.0-9.el9_6 ~ * cpe:/a:redhat:rhel_eus:9.6::appstream

II. Public POCs for CVE-2025-59089

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2025-59089

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Patches & Fixes for CVE-2025-59089 (1)

Vendor Advisories for CVE-2025-59089 (11)

IV. Related Vulnerabilities

Same product: kdcproxy
Same vendor: latchset
Same weakness: CWE-770

V. Comments for CVE-2025-59089

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