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NVD / CVE Program· CNA openssl

CVE-2025-68160: Heap out-of-bounds write in BIO_f_linebuffer on short writes

Noroxi assessment

Priority: Monitor (action score 18/100)

  • 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: 0.18% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: OpenSSL OpenSSL 3.0.19, 3.3.6, 3.4.4; azl3 openvmm 0.2.0-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to OpenSSL OpenSSL 3.0.19, 3.3.6, 3.4.4; azl3 openvmm 0.2.0-1 on Azure Linux 3.0 Release Notes 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: Writing large, newline-free data into a BIO chain using the line-buffering filter where the next BIO performs short writes can trigger a heap-based out-of-bounds write. Impact summary: This out-of-bounds write can cause memory corruption which typically results in a crash, leading to Denial of Service for an application. The line-buffering BIO filter (BIO_f_linebuffer) is not used by default in TLS/SSL data paths. In OpenSSL command-line applications, it is typically only pushed onto stdout/stderr on VMS systems. Third-party applications that explicitly use this filter with a BIO chain that can short-write and that write large, newline-free data influenced by an attacker would be affected. However, the circumstances where this could happen are unlikely to be under attacker control, and BIO_f_linebuffer is unlikely to be handling non-curated data controlled by an attacker. For that reason the issue was assessed as Low severity. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the BIO implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Jan 27, 2026
Updated
Oct 15, 2026
EPSS
0.1% · 8th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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

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  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

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Affected 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.

VendorProduct
opensslopenssl

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Affected versions

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

  • openssl openssl1.0.2 and later · before 1.0.2zn
  • openssl openssl1.1.1 and later · before 1.1.1ze
  • openssl openssl3.0.0 and later · before 3.0.19
  • openssl openssl3.3.0 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
    • 1.1.1 and later · before 1.1.1zeaffected
    • 1.0.2 and later · before 1.0.2znaffected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10opensslbefore 1:3.5.1-7.el10_1.alma.11:3.5.1-7.el10_1.alma.1
AlmaLinux:10openssl-develbefore 1:3.5.1-7.el10_1.alma.11:3.5.1-7.el10_1.alma.1
AlmaLinux:10openssl-libsbefore 1:3.5.1-7.el10_1.alma.11:3.5.1-7.el10_1.alma.1
AlmaLinux:10openssl-perlbefore 1:3.5.1-7.el10_1.alma.11:3.5.1-7.el10_1.alma.1
AlmaLinux:9opensslbefore 1:3.5.1-7.el9_71:3.5.1-7.el9_7
AlmaLinux:9openssl-develbefore 1:3.5.1-7.el9_71:3.5.1-7.el9_7
AlmaLinux:9openssl-libsbefore 1:3.5.1-7.el9_71:3.5.1-7.el9_7
AlmaLinux:9openssl-perlbefore 1:3.5.1-7.el9_71:3.5.1-7.el9_7
Alpine:v3.17opensslfrom 1.0.2 · before 3.0.19-r03.0.19-r0
Alpine:v3.20opensslfrom 1.0.2 · before 3.3.6-r03.3.6-r0
Alpine:v3.22opensslfrom 1.0.2 · before 3.5.5-r03.5.5-r0
Debian:11opensslbefore 1.1.1w-0+deb11u51.1.1w-0+deb11u5
Debian:12opensslbefore 3.0.18-1~deb12u23.0.18-1~deb12u2
Debian:13opensslbefore 3.5.4-1~deb13u23.5.4-1~deb13u2
Debian:14opensslbefore 3.5.5-13.5.5-1
openSUSE:Leap 15.6openssl-1_0_0before 1.0.2p-150000.3.102.11.0.2p-150000.3.102.1
openSUSE:Leap 15.6openssl-1_1before 1.1.1w-150600.5.21.11.1.1w-150600.5.21.1
openSUSE:Leap 15.6openssl-3before 3.1.4-150600.5.42.13.1.4-150600.5.42.1
openSUSE:Leap 16.0openssl-3before 3.5.0-160000.5.13.5.0-160000.5.1
openSUSE:Tumbleweedopenssl-3before 3.5.3-2.13.5.3-2.1
Red Hat:enterprise_linux:10.1opensslbefore 1:3.5.1-7.el10_11:3.5.1-7.el10_1
Red Hat:enterprise_linux:10.1openssl-debuginfobefore 1:3.5.1-7.el10_11:3.5.1-7.el10_1
Red Hat:enterprise_linux:10.1openssl-debugsourcebefore 1:3.5.1-7.el10_11:3.5.1-7.el10_1
Red Hat:enterprise_linux:10.1openssl-develbefore 1:3.5.1-7.el10_11:3.5.1-7.el10_1

+34

Same product

openssl: all records

Other 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 remKEV
    90Now
  • CVE-2021-3711SM2 Decryption Buffer Overflow
    65This 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-2025-15469Jan 27, 2026 · 'openssl dgst' one-shot codepath silently truncates inputs >16MB
    22Monitor
  • ← EarlierCVE-2025-66199Jan 27, 2026 · TLS 1.3 CompressedCertificate excessive memory allocation
    23Monitor
  • Later →CVE-2025-69418Jan 27, 2026 · Unauthenticated/unencrypted trailing bytes with low-level OCB function calls
    16Monitor

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
OpenSSL OpenSSL3.0.19Vendor (CNA)
OpenSSL OpenSSL3.3.6Vendor (CNA)
OpenSSL OpenSSL3.4.4Vendor (CNA)
OpenSSL OpenSSL3.5.5Vendor (CNA)
OpenSSL OpenSSL3.6.1Vendor (CNA)
azl3 openvmm 0.2.0-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
almalinux:openssl1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:openssl-devel1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:openssl-libs1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:openssl-perl1:3.5.1-7.el10_1.alma.1 · AlmaLinux:10Package registry (OSV)
alpine:openssl3.0.19-r0 · Alpine:v3.17Package registry (OSV)
debian:openssl3.0.18-1~deb12u2 · Debian:12Package registry (OSV)
opensuse:openssl-1_0_01.0.2p-150000.3.102.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:openssl-1_11.1.1w-150600.5.21.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:openssl-33.1.4-150600.5.42.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:openssl1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:openssl-config-fips0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-debuginfo1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:openssl-debugsource1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:openssl-devel1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:openssl-devel-engine0:3.5.6-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-libs1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:openssl-libs-debuginfo1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:openssl-perl1:3.5.1-7.el10_1 · Red Hat:enterprise_linux:10.1Package registry (OSV)
rocky linux:openssl1:3.5.1-7.el10_1 · Rocky Linux:10Package registry (OSV)
suse:openssl-1_0_01.0.2p-150000.3.102.1 · SUSE:Linux Enterprise Module for Legacy 15 SP7Package registry (OSV)
suse:openssl-1_11.1.1w-150600.5.21.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:openssl-1_11.1.1w-150700.11.11.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:openssl-33.1.4-150600.5.42.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:openssl-33.2.3-150700.5.24.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

+1

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.

No history yet (it accumulates with the daily EPSS job).

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 researchers

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

Variant candidates

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

  • CVE-2025-154670 days apartStack buffer overflow in CMS (Auth)EnvelopedData parsing
    57Plan
  • CVE-2026-3178970 days apartHeap Buffer Overflow in Hexadecimal Conversion
    39Monitor
  • CVE-2026-7383133 days apartPossible Heap Buffer Overflow in ASN.1 Multibyte String Conversion
    32Monitor
  • CVE-2026-63072210 days apartHeap Buffer Overflow in CMS Key Unwrapping
    30Monitor
  • CVE-2026-72897245 days apartOut-of-Bounds Access After SSL_set_SSL_CTX() During a Handshake
    30Monitor
  • CVE-2025-694190 days apartOut of bounds write in PKCS12_get_friendlyname() UTF-8 conversion
    29Monitor

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

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/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

  1. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records