CVE-2020-15260Network attack vector

Traffic redirection via hostname-blind TLS connection reuse

Published Mar 10, 2021 · Updated Aug 4, 2024

Certificate validation in PJSIP PJPROJECT 2.10 and earlier allows man-in-the-middle attackers to redirect secure SIP traffic. The pjsip_tpmgr_acquire_transport2 transport selector reuses a TLS connection by matching only IP address, port, and protocol, without comparing the requested destination hostname. Exploitation requires different hostnames to resolve to the same endpoint, such as through DNS spoofing, and causes requests for one SIP destination to travel over a connection authenticated for another.

CVSS severity6.8
Medium
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Certificate validation in PJSIP PJPROJECT 2.10 and earlier allows man-in-the-middle attackers to redirect secure SIP traffic. The pjsip_tpmgr_acquire_transport2 transport selector reuses a TLS connection by matching only IP address, port, and protocol, without comparing the requested destination hostname. Exploitation requires different hostnames to resolve to the same endpoint, such as through DNS spoofing, and causes requests for one SIP destination to travel over a connection authenticated for another.

The record

CVE
CVE-2020-15260
Published
Mar 10, 2021
Updated
Aug 4, 2024
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-297, CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

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

  1. Affected versionversion=<= 2.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=<= 2.10

Published CVSS scores

6.8GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-297Improper Validation of Certificate with Host Mismatch
CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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