CVE-2020-27853

Name: CVE-2020-27853
Creator: NVD / NIST
Published: 2020-10-27T18:15:12.62+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.78%

Last modified Jun 17, 2026

CVE-2020-27853 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Wire before 2020-10-16 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a format string. This affects Wire AVS (Audio, Video, and Signaling) 5.3 through 6.x before 6.4, the Wire Secure Messenger application before 3.49.918 for Android, and the Wire Secure Messenger application before 3.61 for iOS. EPSS estimates a 3.78% chance of exploitation in the next 30 days.

Description

Wire before 2020-10-16 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a format string. This affects Wire AVS (Audio, Video, and Signaling) 5.3 through 6.x before 6.4, the Wire Secure Messenger application before 3.49.918 for Android, and the Wire Secure Messenger application before 3.61 for iOS. This occurs via the value parameter to sdp_media_set_lattr in peerflow/sdp.c.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.78%

88.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-134

Affected Software

Vendor	Product	Versions
Wire	Wire	< 3.21.2936
Wire	Wire	< 3.21.3932
Wire	Wire	< 3.21.3959
Wire	Wire - Audio\, Video\, And Signaling	>= 5.3, < 6.4
Wire	Wire Secure Messenger	< 3.49.918
Wire	Wire Secure Messenger	< 3.61

References

http://github.security.telekom.com/2020/11/wire-secure-messenger-format-string-vulnerability.htmlExploit, Third Party Advisory
https://github.com/wireapp/wire-audio-video-signaling/issues/23#issuecomment-710075689Exploit, Third Party Advisory
http://github.security.telekom.com/2020/11/wire-secure-messenger-format-string-vulnerability.htmlExploit, Third Party Advisory
https://github.com/wireapp/wire-audio-video-signaling/issues/23#issuecomment-710075689Exploit, Third Party Advisory

Timeline

Published: Oct 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27853?

How severe is CVE-2020-27853?

CVE-2020-27853 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.78% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27853?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27853?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST