CVE-2019-20503Public exploitNetwork attack vector

Application crash via undersized SCTP parameters

Published Mar 6, 2020 · Updated Aug 5, 2024

Out-of-bounds reads in usrsctp before 2019-12-20 allow remote attackers to crash an application via a malformed SCTP INIT chunk. The sctp_load_addresses_from_init function accepts parameter lengths smaller than an SCTP parameter header, causing reads beyond valid chunk data. A target application must process the crafted chunk; no privileges are required, but user interaction is required, and no data disclosure or modification is reported.

CVSS severity6.5
Medium
EPSS probability3.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in usrsctp before 2019-12-20 allow remote attackers to crash an application via a malformed SCTP INIT chunk. The sctp_load_addresses_from_init function accepts parameter lengths smaller than an SCTP parameter header, causing reads beyond valid chunk data. A target application must process the crafted chunk; no privileges are required, but user interaction is required, and no data disclosure or modification is reported.

The record

CVE
CVE-2019-20503
Published
Mar 6, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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