CVE-2025-15467: Stack buffer overflow in CMS (Auth)EnvelopedData parsing
Noroxi assessment
Priority: Plan (action score 57/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 74.7% (FIRST EPSS); higher than 99.5% of all records.
- This probability rose by 19 points in the last 7 days.
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: OpenSSL OpenSSL 3.0.19, 3.3.6, 3.4.4.
Add it to your regular patch cycle. Upgrade to OpenSSL OpenSSL 3.0.19, 3.3.6, 3.4.4 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
Primary sources: NVD · CVE.org · FIRST EPSS
Issue summary: Parsing CMS AuthEnvelopedData or EnvelopedData message with maliciously crafted AEAD parameters can trigger a stack buffer overflow. Impact summary: A stack buffer overflow may lead to a crash, causing Denial of Service, or potentially remote code execution. When parsing CMS (Auth)EnvelopedData structures that use AEAD ciphers such as AES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is copied into a fixed-size stack buffer without verifying that its length fits the destination. An attacker can supply a crafted CMS message with an oversized IV, causing a stack-based out-of-bounds write before any authentication or tag verification occurs. Applications and services that parse untrusted CMS or PKCS#7 content using AEAD ciphers (e.g., S/MIME (Auth)EnvelopedData with AES-GCM) are vulnerable. Because the overflow occurs prior to authentication, no valid key material is required to trigger it. While exploitability to remote code execution depends on platform and toolchain mitigations, the stack-based write primitive represents a severe risk. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the CMS implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue. OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.
- BDU:2026-00890
- ALSA-2026:1472
- ALSA-2026:1473
- DSA-6113-1
- openSUSE-SU-2026:10237-1
- openSUSE-SU-2026:20152-1
- RHSA-2026:1472
- RHSA-2026:1473
- RHSA-2026:1496
- RHSA-2026:1503
- RHSA-2026:1519
- RHSA-2026:1594
- RHSA-2026:1733
- RHSA-2026:7261
- RLSA-2026:1472
- RLSA-2026:1473
- SUSE-SU-2026:0309-1
- SUSE-SU-2026:0310-1
- SUSE-SU-2026:0311-1
- SUSE-SU-2026:0312-1
- Published
- Jan 27, 2026
- Updated
- Oct 15, 2026
- EPSS
- 74.7% · 99th percentile▲ 19
- CWE
- CWE-787
Report tools
Action score
57
Plan
Add it to your regular patch cycle.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 22 / 30 · 74.7%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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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.
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
Check your server's TLS configuration
The OpenSSL version can't be seen from outside; the free SSL checker tests your certificate, enabled TLS versions and weak ciphers. Confirm the version on your server with the package manager.
Run the SSL checkAffected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- openssl openssl3.0.0 and later · before 3.0.19
- openssl openssl3.1.0 and later · before 3.3.6
- openssl openssl3.4.0 and later · before 3.4.4
- openssl openssl3.5.0 and later · before 3.5.5
- openssl openssl3.6.0 and later · before 3.6.1
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
- 3.6.0 and later · before 3.6.1affected · semver
- 3.5.0 and later · before 3.5.5affected · semver
- 3.4.0 and later · before 3.4.4affected · semver
- 3.3.0 and later · before 3.3.6affected · semver
- 3.0.0 and later · before 3.0.19affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | openssl | before 1:3.5.1-7.el10_1.alma.1 | 1:3.5.1-7.el10_1.alma.1 |
| AlmaLinux:10 | openssl-devel | before 1:3.5.1-7.el10_1.alma.1 | 1:3.5.1-7.el10_1.alma.1 |
| AlmaLinux:10 | openssl-libs | before 1:3.5.1-7.el10_1.alma.1 | 1:3.5.1-7.el10_1.alma.1 |
| AlmaLinux:10 | openssl-perl | before 1:3.5.1-7.el10_1.alma.1 | 1:3.5.1-7.el10_1.alma.1 |
| AlmaLinux:9 | openssl | before 1:3.5.1-7.el9_7 | 1:3.5.1-7.el9_7 |
| AlmaLinux:9 | openssl-devel | before 1:3.5.1-7.el9_7 | 1:3.5.1-7.el9_7 |
| AlmaLinux:9 | openssl-libs | before 1:3.5.1-7.el9_7 | 1:3.5.1-7.el9_7 |
| AlmaLinux:9 | openssl-perl | before 1:3.5.1-7.el9_7 | 1:3.5.1-7.el9_7 |
| Alpine:v3.17 | openssl | from 3.0.0 · before 3.0.19-r0 | 3.0.19-r0 |
| Alpine:v3.20 | openssl | from 3.0.0 · before 3.3.6-r0 | 3.3.6-r0 |
| Alpine:v3.22 | openssl | from 3.0.0 · before 3.5.5-r0 | 3.5.5-r0 |
| Debian:12 | openssl | before 3.0.18-1~deb12u2 | 3.0.18-1~deb12u2 |
| Debian:13 | openssl | before 3.5.4-1~deb13u2 | 3.5.4-1~deb13u2 |
| Debian:14 | openssl | before 3.5.5-1 | 3.5.5-1 |
| openSUSE:Leap 15.6 | openssl-3 | before 3.1.4-150600.5.42.1 | 3.1.4-150600.5.42.1 |
| openSUSE:Leap 16.0 | openssl-3 | before 3.5.0-160000.5.1 | 3.5.0-160000.5.1 |
| openSUSE:Tumbleweed | openssl-3 | before 3.5.3-2.1 | 3.5.3-2.1 |
| Red Hat:enterprise_linux_eus:10.0 | openssl | before 1:3.2.2-16.el10_0.6 | 1:3.2.2-16.el10_0.6 |
| Red Hat:enterprise_linux_eus:10.0 | openssl-devel | before 1:3.2.2-16.el10_0.6 | 1:3.2.2-16.el10_0.6 |
| Red Hat:enterprise_linux_eus:10.0 | openssl-libs | before 1:3.2.2-16.el10_0.6 | 1:3.2.2-16.el10_0.6 |
| Red Hat:enterprise_linux_eus:10.0 | openssl-perl | before 1:3.2.2-16.el10_0.6 | 1:3.2.2-16.el10_0.6 |
| Red Hat:enterprise_linux:10.1 | openssl | before 1:3.5.1-7.el10_1 | 1:3.5.1-7.el10_1 |
| Red Hat:enterprise_linux:10.1 | openssl-debuginfo | before 1:3.5.1-7.el10_1 | 1:3.5.1-7.el10_1 |
| Red Hat:enterprise_linux:10.1 | openssl-debugsource | before 1:3.5.1-7.el10_1 | 1:3.5.1-7.el10_1 |
+46
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
Published before and after this one in the same product
- ← EarlierCVE-2026-22795Jan 27, 2026 · Missing ASN1_TYPE validation in PKCS#12 parsing22Monitor
- ← EarlierCVE-2026-22796Jan 27, 2026 · ASN1_TYPE Type Confusion in the PKCS7_digest_from_attributes() function21Monitor
- Later →CVE-2026-2673Mar 13, 2026 · OpenSSL TLS 1.3 server may choose unexpected key agreement group26Monitor
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 | 3.0.19 | Vendor (CNA) |
| OpenSSL OpenSSL | 3.3.6 | Vendor (CNA) |
| OpenSSL OpenSSL | 3.4.4 | Vendor (CNA) |
| OpenSSL OpenSSL | 3.5.5 | Vendor (CNA) |
| OpenSSL OpenSSL | 3.6.1 | Vendor (CNA) |
| almalinux:openssl | 1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:openssl-devel | 1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:openssl-libs | 1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:openssl-perl | 1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10 | Package registry (OSV) |
| alpine:openssl | 3.0.19-r0 · Alpine:v3.17 | Package registry (OSV) |
| debian:openssl | 3.0.18-1~deb12u2 · Debian:12 | Package registry (OSV) |
| opensuse:openssl-3 | 3.1.4-150600.5.42.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:openssl | 1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1 | 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-debuginfo | 1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:openssl-debugsource | 1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:openssl-devel | 1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1 | 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 | 1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:openssl-libs-debuginfo | 1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:openssl-perl | 1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| rocky linux:openssl | 1:3.5.1-7.el10_1 · Rocky Linux:10 | Package registry (OSV) |
| suse:openssl-3 | 3.1.4-150600.5.42.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:openssl-3 | 3.2.3-150700.5.24.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7 | Package registry (OSV) |
| suse:openssl-3-livepatches | 0.3-160000.1.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×5
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:8 | 2026-01-28 |
| Proof-of-concept repository on GitHub | stars:15 | 2026-01-30 |
| Proof-of-concept repository on GitHub | stars:1 | 2026-02-03 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-03-14 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-04-07 |
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.
- Published
- First PoCsame day
- TodayOct 29, 2026+275 d
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
- Igor Ustinovremediation developer
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-3178970 days apartHeap Buffer Overflow in Hexadecimal Conversion39Monitor
- CVE-2026-7383133 days apartPossible Heap Buffer Overflow in ASN.1 Multibyte String Conversion32Monitor
- CVE-2026-63072210 days apartHeap Buffer Overflow in CMS Key Unwrapping30Monitor
- CVE-2026-72897245 days apartOut-of-Bounds Access After SSL_set_SSL_CTX() During a Handshake30Monitor
- CVE-2025-694190 days apartOut of bounds write in PKCS12_get_friendlyname() UTF-8 conversion29Monitor
- CVE-2025-681600 days apartHeap out-of-bounds write in BIO_f_linebuffer on short writes18Monitor
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.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
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
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- github.com/openssl/openssl/commit/5f26d4202f5b89664c5c3f3c62086276026ba9a9
- github.com/openssl/openssl/commit/6ced0fe6b10faa560e410e3ee8d6c82f06c65ea3
- github.com/openssl/openssl/commit/ce39170276daec87f55c39dad1f629b56344429e
- github.com/openssl/openssl/commit/d0071a0799f20cc8101730145349ed4487c268dc
- openssl-library.org/news/secadv/20260127.txt
- www.openwall.com/lists/oss-security/2026/01/27/10
- www.openwall.com/lists/oss-security/2026/02/25/6
- access.redhat.com/errata/RHSA-2026:1472
- access.redhat.com/errata/RHSA-2026:1473
- access.redhat.com/errata/RHSA-2026:1496
- access.redhat.com/errata/RHSA-2026:1503
- access.redhat.com/errata/RHSA-2026:1519
- access.redhat.com/errata/RHSA-2026:1594
- access.redhat.com/errata/RHSA-2026:1733
- access.redhat.com/errata/RHSA-2026:1736
- access.redhat.com/errata/RHSA-2026:2072
- access.redhat.com/errata/RHSA-2026:2077
- access.redhat.com/errata/RHSA-2026:2485
- access.redhat.com/errata/RHSA-2026:2563
Vendor advisories and official records. Exploit/PoC links are deliberately left out.