CVE-2020-5753
CVE-2020-5753 is a medium-severity vulnerability in Signal Private Messenger with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-670.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (61st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-670
- Affected product: Signal Private Messenger
- Published:
- Last modified:
Description
Signal Private Messenger Android v4.59.0 and up and iOS v3.8.1.5 and up allows a remote non-contact to ring a victim's Signal phone and disclose currently used DNS server due to ICE Candidate handling before call is answered or declined.
Frequently asked questions
- What is CVE-2020-5753?
- Signal Private Messenger Android v4.59.0 and up and iOS v3.8.1.5 and up allows a remote non-contact to ring a victim's Signal phone and disclose currently used DNS server due to ICE Candidate handling before call is answered or declined.
- How severe is CVE-2020-5753?
- CVE-2020-5753 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2020-5753 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-5753?
- CVE-2020-5753 primarily affects Signal Private Messenger. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-5753?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2020-5753 published?
- CVE-2020-5753 was published on 2020-05-20 and last updated on 2026-06-17.
References
Affected products (2)
- cpe:2.3:a:signal:private_messenger:*:*:*:*:*:android:*:*
- cpe:2.3:a:signal:signal:*:*:*:*:*:iphone_os:*:*
More vulnerabilities in Signal Private Messenger
- CVE-2019-17192 — Critical (CVSS 9.8): The WebRTC component in the Signal Private Messenger application through 4.47.7 for Android processes videoconferencing…
- CVE-2019-17191 — High (CVSS 7.5): The Signal Private Messenger application before 4.47.7 for Android allows a caller to force a call to be answered,…
- CVE-2019-9970 — Medium (CVSS 6.5): Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for…
- CVE-2018-3988 — Medium (CVSS 4.7): Signal Messenger for Android 4.24.8 may expose private information when using "disappearing messages." If a user uses…
All CVEs affecting Signal Private Messenger →
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- CVE-2019-17192 — Critical (CVSS 9.8): The WebRTC component in the Signal Private Messenger application through 4.47.7 for Android processes videoconferencing…
- CVE-2026-55276 — Critical (CVSS 9.1): Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty…