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CVE-2023-39946— Heap overflow in push_back_helper due to a CDR message

Quick assessment

Affected
eProsima Fast-DDS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

eProsima Fast DDS是eProsima公司的OMG（对象管理组）DDS（数据分发服务）标准的 C++ 实现。 eProsima Fast DDS 2.9.1版本存在安全漏洞，该漏洞源于通过提供包含长度大于实际内容大小的 CDR 字符串的 PID_PROPERTY_LIST 参数，可以导致堆溢出。

CVSS 8.2 · High EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-39946

Vulnerability Information
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Vulnerability Title
Heap overflow in push_back_helper due to a CDR message
Source: CVE Program / CVE List V5
Vulnerability Description
eprosima Fast DDS is a C++ implementation of the Data Distribution Service standard of the Object Management Group. Prior to versions 2.11.1, 2.10.2, 2.9.2, and 2.6.6, heap can be overflowed by providing a PID_PROPERTY_LIST parameter that contains a CDR string with length larger than the size of actual content. In `eprosima::fastdds::dds::ParameterPropertyList_t::push_back_helper`, `memcpy` is called to first copy the octet'ized length and then to copy the data into `properties_.data`. At the second memcpy, both `data` and `size` can be controlled by anyone that sends the CDR string to the discovery multicast port. This can remotely crash any Fast-DDS process. Versions 2.11.1, 2.10.2, 2.9.2, and 2.6.6 contain a patch for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
eProsima Fast DDS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
eProsima Fast DDS是eProsima公司的OMG（对象管理组）DDS（数据分发服务）标准的 C++ 实现。 eProsima Fast DDS 2.9.1版本存在安全漏洞，该漏洞源于通过提供包含长度大于实际内容大小的 CDR 字符串的 PID_PROPERTY_LIST 参数，可以导致堆溢出。
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
eProsima Fast-DDS < 2.6.6 -

II. Public POCs for CVE-2023-39946

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8949 chars
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III. Intelligence Information for CVE-2023-39946

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Patches & Fixes for CVE-2023-39946 (1)

Vendor Advisories for CVE-2023-39946 (2)

Same Patch Batch · eProsima · 2023-08-11 · 6 CVEs total

CVE-2023-39947 8.2 HIGH Another heap overflow in push_back_helper
CVE-2023-39945 8.2 HIGH Malformed serialized data in a data submessage leads to unhandled exception
CVE-2023-39949 7.5 HIGH Improper validation of sequence numbers leading to remotely reachable assertion failure
CVE-2023-39948 7.5 HIGH Uncaught fastcdr exception (Unexpected CDR type received) crashing fastdds
CVE-2023-39534 7.5 HIGH Malformed GAP submessage triggers assertion failure

IV. Related Vulnerabilities

Same product: Fast-DDS
Same vendor: eProsima
Same weakness: CWE-122

V. Comments for CVE-2023-39946

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