CVE-2025-0825

CRLF injection in Cpp-httplib

MEDIUM
5.3
CVSS Score
Published: February 4, 2025 at 02:11 PM UTC
Updated: June 17, 2026 at 08:27 AM UTC
1 product affected across 1 vendorCpp Httplib

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

cpp-httplib version v0.17.3 through v0.18.3 fails to filter CRLF characters ("\r\n") when those are prefixed with a null byte. This enables attackers to exploit CRLF injection that could further lead to HTTP Response Splitting, XSS, and more.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.17.3 ≤ v < 0.18.4
Affected range stops below 0.18.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

ExploitThird Party Advisory
Source: 596c5446-0ce5-4ba2-aa66-48b3b757a647
https://advisory.checkmarx.net/advisory/CVE-2025-0825/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-113

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