CVE-2023-38703Network attack vector

Remote memory corruption via SRTP transport race

Published Oct 6, 2023 · Updated Feb 13, 2025

Use-after-free in PJSIP PJPROJECT 2.13.1 and earlier allows remote attackers to cause crashes or memory corruption via SRTP media transport. The SRTP higher-level transport can outlive and access a freed underlying transport when callbacks race with destruction, particularly with non-UDP transports. Exploitation requires an application built with PJMEDIA_HAS_SRTP and using an underlying transport other than UDP; consequences range from service interruption to control-flow hijack.

CVSS severity9.8
Critical
EPSS probability1.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in PJSIP PJPROJECT 2.13.1 and earlier allows remote attackers to cause crashes or memory corruption via SRTP media transport. The SRTP higher-level transport can outlive and access a freed underlying transport when callbacks race with destruction, particularly with non-UDP transports. Exploitation requires an application built with PJMEDIA_HAS_SRTP and using an underlying transport other than UDP; consequences range from service interruption to control-flow hijack.

The record

CVE
CVE-2023-38703
Published
Oct 6, 2023
Updated
Feb 13, 2025
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-416, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.13.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=<= 2.13.1

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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