Description
The Open Connectivity Foundation UPnP specification before 2020-04-17 does not forbid the acceptance of a subscription request with a delivery URL on a different network segment than the fully qualified event-subscription URL, aka the CallStranger issue.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gupnp | 1.2.3-1 | — |
| Debian 14 | minidlna | 1.2.1+dfsg-3 | — |
| Debian 14 | wpa | 2:2.9.0-16 | — |
| Debian 13 | gupnp | 1.2.3-1 | — |
| Debian 13 | minidlna | 1.2.1+dfsg-3 | — |
| Debian 13 | wpa | 2:2.9.0-16 | — |
| Debian 12 | gupnp | 1.2.3-1 | — |
| Debian 12 | minidlna | 1.2.1+dfsg-3 | — |
| Debian 12 | pupnp-1.8 | No fix yet | — |
| Debian 12 | wpa | 2:2.9.0-16 | — |
| Debian 10 | minidlna | 1.2.1+dfsg-2+deb10u1 | DSA-4806-1 |
| Debian 10 | wpa | 2:2.7+git20190128+0c1e29f-6+deb10u3 | DSA-4898-1 |
| Debian 9 | gupnp | 1.0.1-1+deb9u1 | DLA-2315-1 |
| Debian 9 | minidlna | 1.1.6+dfsg-1+deb9u1 | DLA-2489-1 |
| Debian 9 | wpa | 2:2.4-1+deb9u7 | DLA-2318-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | pupnp-1.8 | No fix yet | — |
| Ubuntu 20.04 LTS | gupnp | 1.2.3-0ubuntu0.20.04.1 | USN-4494-1 |
| Ubuntu 20.04 LTS | minidlna | 1.2.1+dfsg-1ubuntu0.20.04.1 | USN-4722-1 |
| Ubuntu 20.04 LTS | pupnp-1.8 | No fix yet | — |
| Ubuntu 20.04 LTS | wpa | 2:2.9-1ubuntu4.2 | USN-4734-1 |
| Ubuntu 18.04 LTS | gupnp +2 | No fix yet | — |
| Ubuntu 18.04 LTS | minidlna | 1.2.1+dfsg-1ubuntu0.18.04.1 | USN-4722-1 |
| Ubuntu 18.04 LTS | wpa | 2:2.6-15ubuntu2.7 | USN-4734-1 |
| Ubuntu 16.04 LTS | gupnp | No fix yet | — |
| Ubuntu 16.04 LTS | minidlna | 1.1.5+dfsg-2ubuntu0.1 | USN-4722-1 |
| Ubuntu 16.04 LTS | wpa | 2.4-0ubuntu6.7 | USN-4734-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | libupnp | No fix yet | — |
| Ubuntu Pro 14.04 LTS | wpa | 2.1-0ubuntu1.7+esm3 | USN-4734-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | gssdp +2 | 1.0.5-1.el8 | RHSA-2021:1789 |
| RHEL 8 | gupnp +1 | 1.0.6-1.el8 | RHSA-2021:1789 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | gssdp +2 | 1.0.5-1.el8 | ALSA-2021:1789 |
| AlmaLinux 8 | gupnp-devel | 1.0.6-1.el8 | ALSA-2021:1789 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | gssdp | 1.0.5-1.el8 | RLSA-2021:1789 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP2 | hostapd | 2.9-bp152.2.3.1 | openSUSE-SU-2021:0545-1 |
| SUSE Package Hub 15 SP2 | minidlna | 1.3.0-bp152.4.3.1 | openSUSE-SU-2020:2204-1 |
| SUSE Package Hub 15 SP1 | minidlna | 1.3.0-bp151.2.3.1 | openSUSE-SU-2020:2226-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gupnp | 1.2.7-2.2 | openSUSE-SU-2024:10837-1 |
| openSUSE Tumbleweed | hostapd | 2.9-6.2 | openSUSE-SU-2024:10846-1 |
| openSUSE Tumbleweed | minidlna | 1.3.0-2.7 | openSUSE-SU-2024:11050-1 |
| openSUSE Leap 15.2 | hostapd | 2.9-lp152.2.3.1 | openSUSE-SU-2021:0519-1 |
| openSUSE Leap 15.2 | minidlna | 1.3.0-lp152.4.3.1 | openSUSE-SU-2020:2160-1 |
| openSUSE Leap 15.1 | minidlna | 1.3.0-lp151.3.3.1 | openSUSE-SU-2020:2194-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | hostapd | 2.9-r2 | — |
| Alpine v3.24 | minidlna | 1.2.1-r2 | — |
| Alpine v3.23 | hostapd | 2.9-r2 | — |
| Alpine v3.23 | minidlna | 1.2.1-r2 | — |
| Alpine v3.22 | hostapd | 2.9-r2 | — |
| Alpine v3.22 | minidlna | 1.2.1-r2 | — |
| Alpine v3.21 | hostapd | 2.9-r2 | — |
| Alpine v3.21 | minidlna | 1.2.1-r2 | — |
| Alpine v3.20 | hostapd | 2.9-r2 | — |
| Alpine v3.20 | minidlna | 1.2.1-r2 | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | hostapd | 2.9-r2 | — |
| Alpine v3.19 | minidlna | 1.2.1-r2 | — |
| Alpine v3.18 | hostapd | 2.9-r2 | — |
| Alpine v3.18 | minidlna | 1.2.1-r2 | — |
| Alpine v3.17 | hostapd | 2.9-r2 | — |
| Alpine v3.17 | minidlna | 1.2.1-r2 | — |
| Alpine v3.16 | hostapd | 2.9-r2 | — |
| Alpine v3.16 | minidlna | 1.2.1-r2 | — |
| Alpine v3.15 | hostapd | 2.9-r2 | — |
| Alpine v3.15 | minidlna | 1.2.1-r2 | — |
| Alpine v3.14 | hostapd | 2.9-r2 | — |
| Alpine v3.14 | minidlna | 1.2.1-r2 | — |
| Alpine v3.13 | hostapd | 2.9-r2 | — |
| Alpine v3.13 | minidlna | 1.2.1-r2 | — |
| Alpine v3.12 | hostapd | 2.9-r2 | — |
| Alpine v3.12 | minidlna | 1.2.1-r2 | — |
| Alpine v3.11 | hostapd | 2.9-r2 | — |
| Alpine v3.10 | hostapd | 2.8-r3 | — |
| Alpine v3.9 | hostapd | 2.7-r6 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | gssdp +2 | 1.0.5-1.el8 | ELSA-2021-1789 |
| Oracle Linux 8 | gupnp +1 | 1.0.6-1.el8 | ELSA-2021-1789 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 2 repositories
-
yunuscadirci/CallStranger ★ 403 · Jun 8, 2020
Vulnerability checker for Callstranger (CVE-2020-12695)
-
corelight/callstranger-detector ★ 6 · Jun 10, 2020
Zeek Plugin that detects CallStranger (CVE-2020-12695) attempts (http://callstranger.com/)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 22
- ALSA-2021:1789 Moderate: gssdp and gupnp security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:1789 Red Hat Security Advisory: gssdp and gupnp security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4494-1 gupnp vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4734-2 wpa vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4734-1 wpa vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4722-1 minidlna vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4898-1 wpa - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4806-1 minidlna - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2489-1 minidlna - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2315-1 gupnp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2318-1 wpa - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:1789 Moderate: gssdp and gupnp security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:11050-1 minidlna-1.3.0-2.7 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2160-1 Security update for minidlna SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10846-1 hostapd-2.9-6.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10837-1 libgupnp-1_2-0-1.2.7-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2226-1 Security update for minidlna SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0545-1 Security update for hostapd SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2194-1 Security update for minidlna SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2204-1 Security update for minidlna SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0519-1 Security update for hostapd SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2021-1789 Moderate: gssdp and gupnp security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
References
- https://www.callstranger.com
- https://www.kb.cert.org/vuls/id/339275
- [oss-security] 20200608 hostapd: UPnP SUBSCRIBE misbehavior in hostapd WPS AP mailing-list
- https://www.tenable.com/blog/cve-2020-12695-callstranger-vulnerability-in-universal-plug-and-play-upnp-puts-billions-of
- https://github.com/yunuscadirci/CallStranger
- http://packetstormsecurity.com/files/158051/CallStranger-UPnP-Vulnerability-Checker.html
- https://corelight.blog/2020/06/10/detecting-the-new-callstranger-upnp-vulnerability-with-zeek/
- https://github.com/corelight/callstranger-detector
- FEDORA-2020-df3e1cfde9 vendor-advisory
- FEDORA-2020-1f7fc0d0c9 vendor-advisory
- FEDORA-2020-e538e3e526 vendor-advisory
- [debian-lts-announce] 20200806 [SECURITY] [DLA 2315-1] gupnp security update mailing-list
- [debian-lts-announce] 20200808 [SECURITY] [DLA 2318-1] wpa security update mailing-list
- USN-4494-1 vendor-advisory
- DSA-4806 vendor-advisory
- [debian-lts-announce] 20201210 [SECURITY] [DLA 2489-1] minidlna security update mailing-list
- DSA-4898 vendor-advisory