High severity · published Apr 12, 2020
CVE-2020-11709
cpp-httplib through 0.5.8 does not filter \r\n in parameters passed into the set_redirect and set_header functions, which creates possibilities for CRLF injection and HTTP…
7.5
CVSS
1.7%
EPSS
No
On KEV
Description
cpp-httplib through 0.5.8 does not filter \r\n in parameters passed into the set_redirect and set_header functions, which creates possibilities for CRLF injection and HTTP response splitting in some specific contexts.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CP
Cpp-httplib · Yhirose
through 0.5.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-11709
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-11709
Exploit
https://gist.github.com/shouc/a9330df817128bc4c4132abf3de09495
Exploit
https://github.com/yhirose/cpp-httplib/issues/425
More from Cpp-httplib
9.9
CVE-2026-45372
cpp-httplib: HTTP header value percent-decoding in server-side `parse_header` enables CRLF injection
9.8
CVE-2025-66570
cpp-httplib Untrusted HTTP Header Handling: Internal Header Shadowing (REMOTE*/LOCAL*)
8.8
CVE-2025-53628
cpp-httplib does not limit the length of a line
8.8
CVE-2023-26130
Versions of the package yhirose/cpp-httplib before 0.12.4 are vulnerable to CRLF Injection when untrusted user input is used to set the content-type header in the HTTP .Patch,…
8.2
CVE-2026-77358
cpp-httplib: Use-after-free of TLS session in WebSocketClient::shutdown_and_close()