CVE-2020-11709

HIGHNVD 7.57.5—

7.5

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 v3: 7.5
EG Score: 7.5(medium)
EPSS: 61.0%
KEV: Not listed

Published

April 12, 2020

Last Modified

August 5, 2025

References (4)

cve@mitrehttps://gist.github.com/shouc/a9330df817128bc4c4132abf3de09495
cve@mitrehttps://github.com/yhirose/cpp-httplib/issues/425
af854a3a-2127-422b-91ae-364da2661108https://gist.github.com/shouc/a9330df817128bc4c4132abf3de09495
af854a3a-2127-422b-91ae-364da2661108https://github.com/yhirose/cpp-httplib/issues/425

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

Data Freshness Timeline

(refreshed 11× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 05:18 UTCEG score recompute
2026-05-27 05:18 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 17:46 UTCOSV refresh

Frequently asked(5)

What is CVE-2020-11709?

CVE-2020-11709 is a high vulnerability published on April 12, 2020. cpp-httplib through 0.5.8 does not filter \r\n in parameters passed into the setredirect and setheader functions, which creates possibilities for CRLF injection and HTTP response splitting in some specific contexts.

When was CVE-2020-11709 disclosed?

CVE-2020-11709 was first published in the National Vulnerability Database on April 12, 2020, with the most recent update on August 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-11709 actively exploited?

CVE-2020-11709 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-11709?

CVE-2020-11709 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2020-11709?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-11709, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-11709

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-11709?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)