CVE-2019-20503

MEDIUMNVD 6.56.5—

6.5

usrsctp before 2019-12-20 has out-of-bounds reads in sctp_load_addresses_from_init.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 85.6%
KEV: Not listed

Published

March 6, 2020

Last Modified

November 21, 2024

References (76)

cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-03/msg00022.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-03/msg00028.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-03/msg00030.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-03/msg00037.html
cve@mitrehttp://seclists.org/fulldisclosure/2020/May/49
cve@mitrehttp://seclists.org/fulldisclosure/2020/May/52
cve@mitrehttp://seclists.org/fulldisclosure/2020/May/55
cve@mitrehttp://seclists.org/fulldisclosure/2020/May/59
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0815
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0816
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0819
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0820
cve@mitrehttps://bugs.chromium.org/p/project-zero/issues/detail?id=1992
cve@mitrehttps://chromereleases.googleblog.com/2020/03/stable-channel-update-for-desktop_18.html
cve@mitrehttps://crbug.com/1059349

Patch Availability(12)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	xul-ext-lightning (1:68.7.0+build1-0ubuntu0.19.10.1) @ eoan	2026-05-23	ubuntu
ubuntu	firefox-mozsymbols (74.0+build3-0ubuntu0.16.04.1) @ xenial	2026-05-23	ubuntu
ubuntu	xul-ext-lightning (1:68.7.0+build1-0ubuntu0.16.04.2) @ xenial	2026-05-23	ubuntu
redhat	chromium-browser-0:80.0.3987.149-1.el6_10	2020-04-01	redhat
redhat	thunderbird-0:68.6.0-1.el8_1	2020-03-23	redhat
redhat	thunderbird-0:68.6.0-1.el8_0	2020-03-23	redhat
redhat	thunderbird-0:68.6.0-1.el6_10	2020-03-23	redhat
redhat	thunderbird-0:68.6.0-1.el7_7	2020-03-19	redhat
redhat	firefox-0:68.6.0-1.el6_10	2020-03-16	redhat
redhat	firefox-0:68.6.0-1.el7_7	2020-03-16	redhat
redhat	firefox-0:68.6.0-1.el8_1	2020-03-16	redhat
redhat	firefox-0:68.6.0-1.el8_0	2020-03-16	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-125Out-of-bounds Read

All Vendor Advisories

(13)

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 / 20× 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.

2026-06-05 06:08 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 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
2026-05-26 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
2026-05-23 03:31 UTCEG score recompute
2026-05-23 03:31 UTCVendor advisory

Frequently asked(5)

What is CVE-2019-20503?

CVE-2019-20503 is a medium vulnerability published on March 6, 2020. usrsctp before 2019-12-20 has out-of-bounds reads in sctploadaddressesfrominit.

When was CVE-2019-20503 disclosed?

CVE-2019-20503 was first published in the National Vulnerability Database on March 6, 2020, 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-2019-20503 actively exploited?

CVE-2019-20503 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 85.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-20503?

CVE-2019-20503 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2019-20503?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-20503, 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-2019-20503

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CVE-2019-20503

Published

Last Modified

References (76)

Patch Availability(12)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-20503?

Same vendor

Same CWE

CVE-2019-20503

📅 Published

🔄 Last Modified

🔗 References (76)

Patch Availability(12)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-20503?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (76)

Frequently asked(5)

Related CVEs(same vendor + same CWE)