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NVD / CVE Program· CNA openssl

CVE-2023-1255: Input buffer over-read in AES-XTS implementation on 64 bit ARM

Noroxi assessment

Priority: Monitor (action score 23/100)

  • 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: 0.95% (FIRST EPSS); higher than 61.3% 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. Special conditions such as timing or configuration are required.
  • Fixed version: OpenSSL OpenSSL 3.0.9, 3.1.1.

Low priority for now. Upgrade to OpenSSL OpenSSL 3.0.9, 3.1.1 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: The AES-XTS cipher decryption implementation for 64 bit ARM platform contains a bug that could cause it to read past the input buffer, leading to a crash. Impact summary: Applications that use the AES-XTS algorithm on the 64 bit ARM platform can crash in rare circumstances. The AES-XTS algorithm is usually used for disk encryption. The AES-XTS cipher decryption implementation for 64 bit ARM platform will read past the end of the ciphertext buffer if the ciphertext size is 4 mod 5 in 16 byte blocks, e.g. 144 bytes or 1024 bytes. If the memory after the ciphertext buffer is unmapped, this will trigger a crash which results in a denial of service. If an attacker can control the size and location of the ciphertext buffer being decrypted by an application using AES-XTS on 64 bit ARM, the application is affected. This is fairly unlikely making this issue a Low severity one.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Apr 20, 2023
Updated
Jun 17, 2026
EPSS
0.9% · 61th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

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.

Follow CVE-2023-1255

When you'll hear from us

  • 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 openssl3.0.0 and later · before 3.0.9
  • openssl openssl3.1.0 and later · before 3.1.1

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

    • 3.1.0 and later · before 3.1.1affected · semver
    • 3.0.0 and later · before 3.0.9affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9opensslbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
AlmaLinux:9openssl-develbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
AlmaLinux:9openssl-libsbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
AlmaLinux:9openssl-perlbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
Alpine:v3.15openssl3before 3.0.8-r33.0.8-r3
Alpine:v3.17opensslfrom 3.0.0 · before 3.0.8-r43.0.8-r4
Alpine:v3.18opensslfrom 3.0.0 · before 3.1.0-r43.1.0-r4
Debian:12opensslbefore 3.0.9-13.0.9-1
openSUSE:Leap 15.4openssl-3before 3.0.8-150400.4.26.13.0.8-150400.4.26.1
openSUSE:Leap 15.5openssl-3before 3.0.8-150500.5.3.13.0.8-150500.5.3.1
openSUSE:Tumbleweedopenssl-3before 3.1.1-1.13.1.1-1.1
Red Hat:enterprise_linux:9::appstreamopenssl-debuginfobefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
Red Hat:enterprise_linux:9::appstreamopenssl-debugsourcebefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
Red Hat:enterprise_linux:9::appstreamopenssl-develbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
Red Hat:enterprise_linux:9::appstreamopenssl-libs-debuginfobefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
Red Hat:enterprise_linux:9::appstreamopenssl-perlbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
Red Hat:enterprise_linux:9::baseosopensslbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
Red Hat:enterprise_linux:9::baseosopenssl-libsbefore 1:3.0.7-16.el9_21:3.0.7-16.el9_2
SUSE:Linux Enterprise Module for Basesystem 15 SP4openssl-3before 3.0.8-150400.4.26.13.0.8-150400.4.26.1
SUSE:Linux Enterprise Module for Basesystem 15 SP5openssl-3before 3.0.8-150500.5.3.13.0.8-150500.5.3.1

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-2023-0465Mar 28, 2023 · Invalid certificate policies in leaf certificates are silently ignored
    22Monitor
  • ← EarlierCVE-2023-0466Mar 28, 2023 · Certificate policy check not enabled
    22Monitor
  • Later →CVE-2023-2650May 30, 2023 · Possible DoS translating ASN.1 object identifiers
    48Plan

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 OpenSSL3.0.9Vendor (CNA)
OpenSSL OpenSSL3.1.1Vendor (CNA)
almalinux:openssl1:3.0.7-16.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:openssl-devel1:3.0.7-16.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:openssl-libs1:3.0.7-16.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:openssl-perl1:3.0.7-16.el9_2 · AlmaLinux:9Package registry (OSV)
alpine:openssl3.0.8-r4 · Alpine:v3.17Package registry (OSV)
alpine:openssl33.0.8-r3 · Alpine:v3.15Package registry (OSV)
debian:openssl3.0.9-1 · Debian:12Package registry (OSV)
opensuse:openssl-33.0.8-150400.4.26.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:openssl1:3.0.7-16.el9_2 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:openssl-debuginfo1:3.0.7-16.el9_2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:openssl-debugsource1:3.0.7-16.el9_2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:openssl-devel1:3.0.7-16.el9_2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:openssl-libs1:3.0.7-16.el9_2 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:openssl-libs-debuginfo1:3.0.7-16.el9_2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:openssl-perl1:3.0.7-16.el9_2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
suse:openssl-33.0.8-150400.4.26.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4Package 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.

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.

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

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-primary

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

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (3 more)

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

All records