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CVE-2019-20503: usrsctp before 2019-12-20 has out-of-bounds reads in sctp_load_addresses_from_init.

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MEDIUM 6.5WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2019-20503 is a medium-severity flaw (CVSS 6.5) affecting usrsctp, debian linux, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

  • Public exploit reference
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance3.1% (top 12%)
CISA exploited listNo
WeaknessCWE-125
Published2020-03-06
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: canonical · debian · usrsctp project

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

usrsctp project usrsctp UPGRADE
Affected: < 0.9.4.0
Fixed in: 0.9.4.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy usrsctp || rpm -q usrsctp || usrsctp --version
2. UPGRADE to 0.9.4.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade usrsctp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade usrsctp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
debian debian linux MITIGATE
Affected: 8.0 · 9.0 · 10.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
canonical ubuntu linux MITIGATE
Affected: 16.04 · 18.04 · 19.10
Fixed in: no fixed release known
Safe to downgrade to: a release before 16.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-20503?

usrsctp: upgrade to 0.9.4.0; debian linux: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-20503 being exploited?

CVE-2019-20503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-20503 affect?

CVE-2019-20503 affects usrsctp, debian linux, ubuntu linux. Severity is medium (CVSS 6.5). usrsctp before 2019-12-20 has out-of-bounds reads in sctp_load_addresses_from_init.

How urgent is CVE-2019-20503?

Priority 55/100. Public exploit reference; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities

References

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