CVE-2025-0825 | BDVDB-2026-265295 Detail

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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

References#

Exploit#

No public exploit known

History#

Version 12025-02-04Record published in the CVE List.
Version 22025-05-23Most recent update recorded in the CVE List.

Published

Published: 2025-02-04
Last modified: 2025-05-23

Vendor information

Vendor: Not stated
Product: Not stated

Score

6.9 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 35.5.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= v0.17.3 and <= v0.18.3
Fixed
Not stated

Scoring System

CVSS v4.0

6.9 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	None
User Interaction	Active
Vulnerable System Confidentiality	None
Vulnerable System Integrity	High
Vulnerable System Availability	None
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).