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Fencer Vulns
medium 4.7

CVE-2020-10932 json

An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15

published 2020-04-15 6 y ago modified 2026-07-18 3 mo ago also EUVD-2020-3338 , JLSEC-2025-201

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reconstructing the projective coordinate of the result of scalar multiplication by exploiting side channels in the conversion to affine coordinates; (2) using an attack described by Naccache, Smart, and Stern in 2003 to recover a few bits of the ephemeral scalar from those projective coordinates via several measurements; and (3) using a lattice attack to get from there to the long-term ECDSA private key used for the signatures. Typically an attacker would have sufficient access when attacking an SGX enclave and controlling the untrusted OS.

Patch / fix

  • julia MbedTLS_jll 2.16.6+0
  • arm mbed_tls 2.7.15
  • trustedfirmware mbed_tls 2.16.6
  • mbedtls Debian 14, Debian 13, Debian 12 2.16.9-0.1

debian advisories DEBIAN-CVE-2020-10932

  • mbedtls Package Hub 15 SP2 2.16.9-bp152.2.3.1
  • mbedtls openSUSE Leap 15.2 2.16.9-lp152.2.3.1

opensuse advisories openSUSE-SU-2021:0397-1openSUSE-SU-2021:0384-1

  • mbedtls Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 2.16.6-r0
  • mbedtls2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2.16.6-r0
  • mbedtls3 Alpine 3.24 2.16.6-r0

alpine advisories ALPINE-CVE-2020-10932

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mbedtls Arch Linux 2.16.7-1

arch linux advisories AVG-1141

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10932 updated cvss 5.5

mbedtls: side channel attack possibly leading to information disclosure

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N
OSV 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia MbedTLS_jll
<2.16.6+0
2.16.6+0

Classification

Weakness
  • CWE-203 Observable Discrepancy
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.