Timing side-channel in SM2 algorithm on 64 bit ARM
Noroxi assessment
Priority: Monitor (action score 27/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 2.2% (FIRST EPSS); higher than 82.3% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: OpenSSL OpenSSL 3.2.6, 3.3.5, 3.4.3.
Low priority for now. Upgrade to OpenSSL OpenSSL 3.2.6, 3.3.5, 3.4.3 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Issue summary: A timing side-channel which could potentially allow remote recovery of the private key exists in the SM2 algorithm implementation on 64 bit ARM platforms. Impact summary: A timing side-channel in SM2 signature computations on 64 bit ARM platforms could allow recovering the private key by an attacker.. While remote key recovery over a network was not attempted by the reporter, timing measurements revealed a timing signal which may allow such an attack. OpenSSL does not directly support certificates with SM2 keys in TLS, and so this CVE is not relevant in most TLS contexts. However, given that it is possible to add support for such certificates via a custom provider, coupled with the fact that in such a custom provider context the private key may be recoverable via remote timing measurements, we consider this to be a Moderate severity issue. The FIPS modules in 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected by this issue, as SM2 is not an approved algorithm.
- Published
- Sep 30, 2025
- Updated
- Jul 14, 2026
- EPSS
- 2.2% · 82th percentile
- CWE
- CWE-385
Report tools
Action score
27
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Running WordPress? Scan your site free with WP Lens
Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.
OpenSSL OpenSSL
- 3.5.0 and later · before 3.5.4affected · semver
- 3.4.0 and later · before 3.4.3affected · semver
- 3.3.0 and later · before 3.3.5affected · semver
- 3.2.0 and later · before 3.2.6affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.20 | openssl | before 3.3.5-r0 | 3.3.5-r0 |
| Alpine:v3.22 | openssl | before 3.5.4-r0 | 3.5.4-r0 |
| Debian:13 | openssl | before 3.5.1-1+deb13u1 | 3.5.1-1+deb13u1 |
| Debian:14 | openssl | before 3.5.4-1 | 3.5.4-1 |
| openSUSE:Leap 16.0 | openssl-3 | before 3.5.0-160000.4.1 | 3.5.0-160000.4.1 |
| openSUSE:Tumbleweed | openssl-3 | before 3.5.3-2.1 | 3.5.3-2.1 |
| openSUSE:Tumbleweed | regclient | before 0.10.0-1.1 | 0.10.0-1.1 |
| Red Hat:hummingbird:1 | openssl | before 0:3.5.6-0.1.hum1 | 0:3.5.6-0.1.hum1 |
| Red Hat:hummingbird:1 | openssl-config-fips | before 0:3.5.6-0.1.hum1 | 0:3.5.6-0.1.hum1 |
| Red Hat:hummingbird:1 | openssl-devel | before 0:3.5.6-0.1.hum1 | 0:3.5.6-0.1.hum1 |
| Red Hat:hummingbird:1 | openssl-devel-engine | before 0:3.5.6-0.1.hum1 | 0:3.5.6-0.1.hum1 |
| Red Hat:hummingbird:1 | openssl-libs | before 0:3.5.6-0.1.hum1 | 0:3.5.6-0.1.hum1 |
| Red Hat:hummingbird:1 | openssl-perl | before 0:3.5.6-0.1.hum1 | 0:3.5.6-0.1.hum1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | openssl | before 3.5.0-150700.3.4.1 | 3.5.0-150700.3.4.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | openssl-3 | before 3.5.0-150700.5.45.2 | 3.5.0-150700.5.45.2 |
| SUSE:Linux Enterprise Module for Web and Scripting 15 SP7 | nodejs24 | before 24.18.1-150700.15.18.1 | 24.18.1-150700.15.18.1 |
| SUSE:Linux Enterprise Server 16.0 | openssl-3 | before 3.5.0-160000.4.1 | 3.5.0-160000.4.1 |
Same product
openssl: all recordsOther highest-scoring records for the same primary product.
- CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remKEV90Now
- CVE-2021-3711SM2 Decryption Buffer Overflow65This week
- CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code 65This week
- CVE-2016-2108The ASN.1 implementation in OpenSSL before 1.0.1o and 1.0.2 before 1.0.2c allows remote attackers to execute arbitrary code or cause a denia62This week
- CVE-2016-6309statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a den60This week
- CVE-2022-3786X.509 Email Address Variable Length Buffer Overflow58Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| OpenSSL OpenSSL | 3.2.6 | Vendor (CNA) |
| OpenSSL OpenSSL | 3.3.5 | Vendor (CNA) |
| OpenSSL OpenSSL | 3.4.3 | Vendor (CNA) |
| OpenSSL OpenSSL | 3.5.4 | Vendor (CNA) |
| alpine:openssl | 3.3.5-r0 · Alpine:v3.20 | Package registry (OSV) |
| debian:openssl | 3.5.1-1+deb13u1 · Debian:13 | Package registry (OSV) |
| opensuse:openssl-3 | 3.5.0-160000.4.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:regclient | 0.10.0-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:openssl | 0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| red hat:openssl-config-fips | 0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| red hat:openssl-devel | 0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| red hat:openssl-devel-engine | 0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| red hat:openssl-libs | 0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| red hat:openssl-perl | 0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| suse:nodejs24 | 24.18.1-150700.15.18.1 · SUSE:Linux Enterprise Module for Web and Scripting 15 SP7 | Package registry (OSV) |
| suse:openssl | 3.5.0-150700.3.4.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7 | Package registry (OSV) |
| suse:openssl-3 | 3.5.0-160000.4.1 · SUSE:Linux Enterprise Server 16.0 | Package 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.
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.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Stanislav Fort (Aisle Research)reporter
- Tomas Mrazremediation developer
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2024-13176253 days apartTiming side-channel in ECDSA signature computation16Monitor
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.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-385 · Covert Timing ChannelCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (10 more)Show less
- github.com/openssl/openssl/commit/cba616c26ac8e7b37de5e77762e505ba5ca51698
- github.com/openssl/openssl/commit/eed5adc9f969d77c94f213767acbb41ff923b6f4
- github.com/openssl/openssl/commit/fc47a2ec078912b3e914fab5734535e76c4820c2
- openssl-library.org/news/secadv/20250930.txt
- www.openwall.com/lists/oss-security/2025/09/30/5
- www.openwall.com/lists/oss-security/2026/05/11/11
- cert-portal.siemens.com/productcert/html/ssa-032379.html
- cert-portal.siemens.com/productcert/html/ssa-089022.html
- cert-portal.siemens.com/productcert/html/ssa-253495.html
- cert-portal.siemens.com/productcert/html/ssa-585531.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.