CVE-2019-19330

CRITICALNVD 9.89.8—

9.8

The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 77.9%
KEV: Not listed

Published

November 27, 2019

Last Modified

November 21, 2024

References (16)

cve@mitrehttps://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=ac198b92d461515551b95daae20954b3053ce87e
cve@mitrehttps://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=146f53ae7e97dbfe496d0445c2802dd0a30b0878
cve@mitrehttps://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=54f53ef7ce4102be596130b44c768d1818570344
cve@mitrehttps://seclists.org/bugtraq/2019/Nov/45
cve@mitrehttps://security.gentoo.org/glsa/202004-01
cve@mitrehttps://tools.ietf.org/html/rfc7540#section-10.3
cve@mitrehttps://usn.ubuntu.com/4212-1/
cve@mitrehttps://www.debian.org/security/2019/dsa-4577
af854a3a-2127-422b-91ae-364da2661108https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=ac198b92d461515551b95daae20954b3053ce87e
af854a3a-2127-422b-91ae-364da2661108https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=146f53ae7e97dbfe496d0445c2802dd0a30b0878
af854a3a-2127-422b-91ae-364da2661108https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=54f53ef7ce4102be596130b44c768d1818570344
af854a3a-2127-422b-91ae-364da2661108https://seclists.org/bugtraq/2019/Nov/45
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202004-01
af854a3a-2127-422b-91ae-364da2661108https://tools.ietf.org/html/rfc7540#section-10.3
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/4212-1/

Patch Availability(5)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	vim-haproxy (2.0.5-1ubuntu0.3) @ eoan	2026-05-27	ubuntu
redhat	rh-haproxy18-haproxy-0:1.8.24-2.el7	2020-05-26	redhat
redhat	haproxy-0:2.0.13-3.el7	2020-05-04	redhat
redhat	haproxy-0:1.8.23-3.el8	2020-04-28	redhat
redhat	haproxy-0:1.8.23-3.el7	2020-04-07	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

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)

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× 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
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-27 11:05 UTCEG score recompute
2026-05-27 11:05 UTCVendor advisory
2026-05-27 11:05 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
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2019-19330?

CVE-2019-19330 is a critical vulnerability published on November 27, 2019. The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.

When was CVE-2019-19330 disclosed?

CVE-2019-19330 was first published in the National Vulnerability Database on November 27, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-19330 actively exploited?

CVE-2019-19330 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 77.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-19330?

CVE-2019-19330 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2019-19330?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-19330, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-19330

Explore →

Is Your Infrastructure Affected by CVE-2019-19330?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2019-19330

Published

Last Modified

References (16)

Patch Availability(5)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-19330?

Same vendor

Same CWE

CVE-2019-19330

📅 Published

🔄 Last Modified

🔗 References (16)

Patch Availability(5)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-19330?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (16)

Frequently asked(5)

Related CVEs(same vendor + same CWE)