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CVE-2017-2784· NVD / CVE Program· CNA talos

An exploitable free of a stack pointer vulnerability exists in the x509 certificate parsing code of ARM mbed TLS before 1.3.19, 2.x before 2

An exploitable free of a stack pointer vulnerability exists in the x509 certificate parsing code of ARM mbed TLS before 1.3.19, 2.x before 2.1.7, and 2.4.x before 2.4.2. A specially crafted x509 certificate, when parsed by mbed TLS library, can cause an invalid free of a stack pointer leading to a potential remote code execution. In order to exploit this vulnerability, an attacker can act as either a client or a server on a network to deliver malicious x509 certificates to vulnerable applications.

HighCVSS 8.1 · v3.0—No exploit Fix available
Published
Apr 20, 2017
Updated
Jun 16, 2026
EPSS
3.4% · 88th percentile
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Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.4%

CNA vs NVD score

NVD
8.1
CNA · talos
8.1
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
trustedfirmwarembed tls

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • trustedfirmware mbed tlsup to 1.3.18 inclusive
  • trustedfirmware mbed tls2.0.0
  • trustedfirmware mbed tls2.1.0
  • trustedfirmware mbed tls2.1.1
  • trustedfirmware mbed tls2.1.2
  • trustedfirmware mbed tls2.1.3
  • trustedfirmware mbed tls2.1.4
  • trustedfirmware mbed tls2.1.5
  • trustedfirmware mbed tls2.1.6
  • trustedfirmware mbed tls2.4.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (talos). Independent of NVD's CPE analysis and usually ahead of it.

  • ARM mbed TLS

    • 2.4.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10mbedtlsbefore 2.4.2-r02.4.2-r0
Debian:12mbedtlsbefore 2.4.2-12.4.2-1
openSUSE:Tumbleweedmbedtls-2before 2.27.0-1.22.27.0-1.2
openSUSE:Tumbleweedmbedtls-3before 3.6.6-1.13.6.6-1.1
SUSE:Package Hub 12mbedtlsbefore 1.3.19-5.11.3.19-5.1

Same product

trustedfirmware: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-34875An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0.
    39Monitor
  • CVE-2024-49195Mbed TLS 3.5.x through 3.6.x before 3.6.2 has a buffer underrun in pkwrite when writing an opaque key pair
    39Monitor
  • CVE-2024-45159An issue was discovered in Mbed TLS 3.x before 3.6.1.
    39Monitor
  • CVE-2024-45158An issue was discovered in Mbed TLS 3.6 before 3.6.1.
    39Monitor
  • CVE-2023-45199Mbed TLS 3.2.x through 3.4.x before 3.5 has a Buffer Overflow that can lead to remote Code execution.
    39Monitor
  • CVE-2026-34873An issue was discovered in Mbed TLS 3.5.0 through 4.0.0.
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:mbedtls2.4.2-r0 · Alpine:v3.10Package registry (OSV)
debian:mbedtls2.4.2-1 · Debian:12Package registry (OSV)
opensuse:mbedtls-22.27.0-1.2 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:mbedtls-33.6.6-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:mbedtls1.3.19-5.1 · SUSE:Package Hub 12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

The bug in code

The whole CWE-295 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

kotlin
override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {  // Left empty for the test environment}

Fixed

kotlin
val client = OkHttpClient.Builder()  .certificatePinner(    CertificatePinner.Builder()      .add("api.sirius.example", "sha256/…")      .build()  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records