HOMEVULNERABILITIESCVE-2021-36219
CRITICAL

CVE-2021-36219

CWE-824Published: September 27, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

An issue was discovered in SKALE sgxwallet 1.58.3. The provided input for ECALL 14 triggers a branch in trustedEcdsaSign that frees a non-initialized pointer from the stack. An attacker can chain multiple enclave calls to prepare a stack that contains a valid address. This address is then freed, resulting in compromised integrity of the enclave. This was resolved after v1.58.3 and not reproducible in sgxwallet v1.77.0.

NVD Source

Technical Analysis

CVE-2021-36219 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

skale1 product(s)
sgxwallet
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/skalenetwork/sgxwallet/commit/4e9b5b7526db083177e81f8bafeaa4914d276a82
PATCHhttps://github.com/skalenetwork/sgxwallet/commit/4e9b5b7526db083177e81f8bafeaa4914d276a82
ADVISORYhttps://github.com/skalenetwork/sgxwallet/releases
ADVISORYhttps://github.com/skalenetwork/sgxwallet/releases

All References (4)

→
https://github.com/skalenetwork/sgxwallet/commit/4e9b5b7526db083177e81f8bafeaa4914d276a82Patch · Third Party Advisory
→
https://github.com/skalenetwork/sgxwallet/releasesRelease Notes · Third Party Advisory
→
https://github.com/skalenetwork/sgxwallet/commit/4e9b5b7526db083177e81f8bafeaa4914d276a82Patch · Third Party Advisory
→
https://github.com/skalenetwork/sgxwallet/releasesRelease Notes · Third Party Advisory

Quick Facts

CVE IDCVE-2021-36219
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-824
CISA KEVNo
Affected1 vendor(s)
PublishedSep 27, 2021

Related CVEs (CWE-824)

CVE-2007-2442
10.0
CVE-2009-0846
10.0
CVE-2018-14356
9.8
CVE-2020-17446
9.8
CVE-2020-11138
9.8
CVE-2017-12561
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-36219 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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