CVE-2019-20503

CVE-2019-20503 is a medium-severity vulnerability in Usrsctp Project Usrsctp with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

• Severity: Medium (CVSS 3.x base score 6.5)
• CVSS v2: 4.3
• EPSS exploit prediction: 3% (86th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-125
• Affected product: Usrsctp Project Usrsctp
• Published: 2020-03-06
• Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2019-20503?

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

How severe is CVE-2019-20503?

CVE-2019-20503 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-20503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20503?

CVE-2019-20503 primarily affects Usrsctp Project Usrsctp. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-20503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-20503 published?

CVE-2019-20503 was published on 2020-03-06 and last updated on 2026-06-17.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00028.html
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00030.html
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00037.html
• http://seclists.org/fulldisclosure/2020/May/49
• http://seclists.org/fulldisclosure/2020/May/52
• http://seclists.org/fulldisclosure/2020/May/55
• http://seclists.org/fulldisclosure/2020/May/59
• https://access.redhat.com/errata/RHSA-2020:0815
• https://access.redhat.com/errata/RHSA-2020:0816
• https://access.redhat.com/errata/RHSA-2020:0819
• https://access.redhat.com/errata/RHSA-2020:0820
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1992
• https://chromereleases.googleblog.com/2020/03/stable-channel-update-for-desktop_18.html
• https://crbug.com/1059349
• https://github.com/sctplab/usrsctp/commit/790a7a2555aefb392a5a69923f1e9d17b4968467
• https://lists.debian.org/debian-lts-announce/2020/03/msg00013.html
• https://lists.debian.org/debian-lts-announce/2020/03/msg00023.html
• https://lists.debian.org/debian-lts-announce/2023/07/msg00003.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2DDNOAGIX5D77TTHT6YPMVJ5WTXTCQEI/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IOHSO6BUKC6I66J5PZOMAGFVJ66ZS57/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWANFIR3PYAL5RJQ4AO3ZS2DYMSF2ZGZ/
• https://security.gentoo.org/glsa/202003-02
• https://security.gentoo.org/glsa/202003-10
• https://support.apple.com/HT211168
• https://support.apple.com/HT211171
• https://support.apple.com/HT211175
• https://support.apple.com/HT211177
• https://support.apple.com/kb/HT211168
• https://support.apple.com/kb/HT211171

Affected products (7)

• cpe:2.3:a:usrsctp_project:usrsctp:*:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*

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