PatchTheCVECVE-2019-14356: On Coldcard MK1 and MK2 devices, a side channel for the row-based OLED display was found
CVE-2019-14356 is a medium-severity flaw (CVSS 5.3) affecting coldcard mk1 firmware, coldcard mk2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
On Coldcard MK1 and MK2 devices, a side channel for the row-based OLED display was found. The power consumption of each row-based display cycle depends on the number of illuminated pixels, allowing a partial recovery of display contents. For example, a hardware implant in the USB cable might be able to leverage this behavior to recover confidential secrets such as the PIN and BIP39 mnemonic. In other words, the side channel is relevant only if th
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.2% (top 32%) |
| CISA exploited list | No |
| Weakness | CWE-203 |
| Published | 2019-10-31 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2019-14356?
coldcard mk1 firmware: upgrade to 2.1.2; coldcard mk2 firmware: upgrade to 2.1.2. Exact commands for each OS are on this page.
Is CVE-2019-14356 being exploited?
CVE-2019-14356 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2019-14356 affect?
CVE-2019-14356 affects coldcard mk1 firmware, coldcard mk2 firmware. Severity is medium (CVSS 5.3). On Coldcard MK1 and MK2 devices, a side channel for the row-based OLED display was found. The power consumption of each row-based display cycle depends on the number of illuminated pixels, allowing a partial recovery of display contents. Fo
How urgent is CVE-2019-14356?
Priority 46/100. Public exploit reference; Remotely exploitable, no login, no user action