cpp-httplib: Malicious `X-Forwarded-For` Under Trusted-Proxy Configuration Triggers Empty `vector::front()`, Leading to Undefined Behavior and Server Crash
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| yhirose | cpp-httplib | affected |
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No data.
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| Yhirose | Cpp-httplib |
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No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.327% probability within 30 days)
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| CPEs | cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:* | |
| Metrics |
cvssV3_1
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| Metrics |
ssvc
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| First Time appeared |
Yhirose
Yhirose cpp-httplib |
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| Vendors & Products |
Yhirose
Yhirose cpp-httplib |
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| Description | cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the server has called Server::set_trusted_proxies() with a non-empty trusted-proxy list, an attacker can send an HTTP request that includes an X-Forwarded-For header whose value parses to no valid IP segments. The code path then executes get_client_ip(), which calls front() on an empty std::vector—undefined behavior in C++. On typical implementations this manifests as abnormal process termination (denial of service). With Sanitizers enabled, you get an explicit runtime diagnostic. This vulnerability is fixed in 0.44.0. | |
| Title | cpp-httplib: Malicious `X-Forwarded-For` Under Trusted-Proxy Configuration Triggers Empty `vector::front()`, Leading to Undefined Behavior and Server Crash | |
| Weaknesses | CWE-476 | |
| References |
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| Metrics |
cvssV4_0
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