CVE-2020-15260 Existing TLS connections can be reused without checking remote hostname
PJSIP reuses TLS connections based on IP address without verifying hostnames, enabling man-in-the-middle attacks via DNS spoofing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-15260?
CVE-2020-15260 is a medium-severity vulnerability in pjsip pjproject, published on 10 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In version 2.10 and earlier, PJSIP transport can be reused if they have the same IP address + port + protocol. However, this is insufficient for secure transport since it lacks remote hostname authentication. Suppose we have created a TLS connection to `sip.foo.com`, which has an IP address `100.1.1.1`. If we want to create a TLS connection to another hostname, say `sip.bar.com`, which has the same IP address, then it will reuse that existing connection, even though `100.1.1.1` does not have certificate to authenticate as `sip.bar.com`. The vulnerability allows for an insecure interaction without user awareness. It affects users who need access to connections to different destinations that translate to the same address, and allows man-in-the-middle attack if attacker can route a connection to another destination such as in the case of DNS spoofing.
Which versions are affected by CVE-2020-15260?
It affects 1 product.
Products include Teluu Pjsip.
How do I fix CVE-2020-15260?
Apply the vendor's patch.
Is CVE-2020-15260 being exploited?
There is no known exploitation of CVE-2020-15260 in the wild and no public exploit code.
Other vulnerabilities in pjsip pjproject
- CVE-2023-38703 PJSIP has use-after-free vulnerability in SRTP media transport
- CVE-2022-39269 Media transport downgrade from the secure version (SRTP) to non-secure (RTP) in pjsip
- CVE-2026-57161 PJSIP: Stack overflow handling Service-Route headers in a registration response
- CVE-2026-57162 PJSIP: Stack overflow parsing SDP a=crypto attributes
- CVE-2026-57163 PJSIP: Stack overflow parsing a TLS peer certificate's SubjectAltName in GnuTLS backend
Sources
Also known as ALPINE-CVE-2020-15260, DEBIAN-CVE-2020-15260, GHSA-8hcp-hm38-mfph, UBUNTU-CVE-2020-15260.