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CVE-2023-3341· NVD / CVE Program· CNA isc

A stack exhaustion flaw in control channel code may cause named to terminate unexpectedly

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 2.8% (FIRST EPSS); higher than 86.5% 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: bind (AlmaLinux:8) 32:9.11.36-8.el8_8.2; bind-chroot (AlmaLinux:8) 32:9.11.36-8.el8_8.2; bind-devel (AlmaLinux:8) 32:9.11.36-8.el8_8.2.

Low priority for now. Upgrade to bind (AlmaLinux:8) 32:9.11.36-8.el8_8.2; bind-chroot (AlmaLinux:8) 32:9.11.36-8.el8_8.2; bind-devel (AlmaLinux:8) 32:9.11.36-8.el8_8.2 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

The code that processes control channel messages sent to `named` calls certain functions recursively during packet parsing. Recursion depth is only limited by the maximum accepted packet size; depending on the environment, this may cause the packet-parsing code to run out of available stack memory, causing `named` to terminate unexpectedly. Since each incoming control channel message is fully parsed before its contents are authenticated, exploiting this flaw does not require the attacker to hold a valid RNDC key; only network access to the control channel's configured TCP port is necessary. This issue affects BIND 9 versions 9.2.0 through 9.16.43, 9.18.0 through 9.18.18, 9.19.0 through 9.19.16, 9.9.3-S1 through 9.16.43-S1, and 9.18.0-S1 through 9.18.18-S1.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Sep 20, 2023
Updated
Jun 17, 2026
EPSS
2.8% · 86th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · isc
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2023-3341

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
iscbind
fedoraprojectfedora
debiandebian linux

Affected versions

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

  • debian debian linux10.0
  • debian debian linux11.0
  • fedoraproject fedora37
  • fedoraproject fedora38
  • isc bind9.19.0 and later · before 9.19.17
  • isc bind9.2.0 and later · before 9.16.44
  • isc bind9.18.0 and later · before 9.18.19
  • isc bind9.10.5
  • isc bind9.10.7
  • isc bind9.11.12
  • isc bind9.11.21
  • isc bind9.11.27
  • isc bind9.11.29
  • isc bind9.11.3
  • isc bind9.11.35
  • isc bind9.11.37
  • isc bind9.11.4
  • isc bind9.11.5
  • isc bind9.11.6
  • isc bind9.11.7

Versions reported by the vendor

Affected version ranges reported by the assigning authority (isc). Independent of NVD's CPE analysis and usually ahead of it.

  • ISC BIND 9

    • 9.2.0 and later · up to and including 9.16.43affected
    • 9.18.0 and later · up to and including 9.18.18affected
    • 9.19.0 and later · up to and including 9.19.16affected
    • 9.9.3-S1 and later · up to and including 9.16.43-S1affected
    • 9.18.0-S1 and later · up to and including 9.18.18-S1affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bindbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-chrootbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-develbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-export-develbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-export-libsbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-libsbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-libs-litebefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-licensebefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-lite-develbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-pkcs11before 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-pkcs11-develbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-pkcs11-libsbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-pkcs11-utilsbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-sdbbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-sdb-chrootbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind-utilsbefore 32:9.11.36-8.el8_8.232:9.11.36-8.el8_8.2
AlmaLinux:8bind9.16before 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1
AlmaLinux:8bind9.16-chrootbefore 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1
AlmaLinux:8bind9.16-develbefore 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1
AlmaLinux:8bind9.16-dnssec-utilsbefore 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1
AlmaLinux:8bind9.16-docbefore 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1
AlmaLinux:8bind9.16-libsbefore 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1
AlmaLinux:8bind9.16-licensebefore 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1
AlmaLinux:8bind9.16-utilsbefore 32:9.16.23-0.14.el8_8.2.alma.132:9.16.23-0.14.el8_8.2.alma.1

+96

Same product

isc: all records

Other highest-scoring records for the same primary product.

  • CVE-2015-5477named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion faKEV
    90Now
  • CVE-2020-8617A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c
    60This week
  • CVE-2016-2776buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x before 9.11.0rc3 does not properly construct responses,
    60This week

Published before and after this one in the same product

  • ← EarlierCVE-2023-2829Jun 21, 2023 · Malformed NSEC records can cause named to terminate unexpectedly when synth-from-dnssec is enabled
    30Monitor
  • ← EarlierCVE-2023-2911Jun 21, 2023 · Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0
    31Monitor
  • Later →CVE-2023-4236Sep 20, 2023 · named may terminate unexpectedly under high DNS-over-TLS query load
    31Monitor

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
almalinux:bind32:9.11.36-8.el8_8.2 · AlmaLinux:8Package registry (OSV)
almalinux:bind-chroot32:9.11.36-8.el8_8.2 · AlmaLinux:8Package registry (OSV)
almalinux:bind-devel32:9.11.36-8.el8_8.2 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.1632:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-chroot32:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-devel32:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-dnssec-utils32:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-doc32:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-libs32:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-license32:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-utils32:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
almalinux:python3-bind9.1632:9.16.23-0.14.el8_8.2.alma.1 · AlmaLinux:8Package registry (OSV)
alpine:bind9.16.44-r0 · Alpine:v3.15Package registry (OSV)
debian:bind91:9.18.19-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:bind9.16.44-150400.5.37.2 · openSUSE:Leap 15.4Package registry (OSV)
red hat:bind9.1632:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-chroot32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-debuginfo32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-debugsource32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-dnssec-utils32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-dnssec-utils-debuginfo32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-libs32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-libs-debuginfo32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-license32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-utils32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-utils-debuginfo32:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:python3-bind9.1632:9.16.23-0.14.el8_8.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:bind2:9.16.23-11.el9_2.2 · Rocky Linux:9Package registry (OSV)
suse:bind9.16.44-150400.5.37.2 · 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.

EPSS, last 120 days

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.

No commit or PR link among the references.

Credits

All researchers

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

  • Eric SesterhennX41 D-Sec GmbH for bringing this vulnerability to our attention.

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.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
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:N/AC:L/PR:N/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 (7 more)

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

All records