Limiting simultaneous TCP clients was ineffective
By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.
- Published
- Oct 9, 2019
- Updated
- Jun 16, 2026
- EPSS
- 6.5% · 94th percentile
- CWE
- CWE-770
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 6.5%
CNA vs NVD score
- NVD
- 7.5
- CNA · isc
- 7.5
- agree
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| f5 | big-ip local traffic manager | cpe:2.3:a:f5:big-ip_local_traffic_manager |
| f5 | big-ip application acceleration manager | cpe:2.3:a:f5:big-ip_application_acceleration_manager |
| f5 | big-ip advanced firewall manager | cpe:2.3:a:f5:big-ip_advanced_firewall_manager |
| f5 | big-ip analytics | cpe:2.3:a:f5:big-ip_analytics |
| f5 | big-ip access policy manager | cpe:2.3:a:f5:big-ip_access_policy_manager |
| f5 | big-ip application security manager | cpe:2.3:a:f5:big-ip_application_security_manager |
| f5 | big-ip edge gateway | cpe:2.3:a:f5:big-ip_edge_gateway |
| f5 | big-ip fraud protection service | cpe:2.3:a:f5:big-ip_fraud_protection_service |
| f5 | big-ip global traffic manager | cpe:2.3:a:f5:big-ip_global_traffic_manager |
| f5 | big-ip link controller | cpe:2.3:a:f5:big-ip_link_controller |
| f5 | big-ip webaccelerator | cpe:2.3:a:f5:big-ip_webaccelerator |
| f5 | big-ip policy enforcement manager | cpe:2.3:a:f5:big-ip_policy_enforcement_manager |
and 5 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- f5 big-ip access policy manager11.5.2 and later · up to 11.6.5 inclusive
- f5 big-ip access policy manager14.0.0 and later · up to 14.1.0 inclusive
- f5 big-ip access policy manager13.1.0 and later · up to 13.1.1 inclusive
- f5 big-ip access policy manager12.1.0 and later · up to 12.1.4 inclusive
- f5 big-ip access policy manager15.0.0
- f5 big-ip advanced firewall manager11.5.2 and later · up to 11.6.5 inclusive
- f5 big-ip advanced firewall manager12.1.0 and later · up to 12.1.4 inclusive
- f5 big-ip advanced firewall manager13.1.0 and later · up to 13.1.1 inclusive
- f5 big-ip advanced firewall manager14.0.0 and later · up to 14.1.0 inclusive
- f5 big-ip advanced firewall manager15.0.0
- f5 big-ip analytics11.5.2 and later · up to 11.6.5 inclusive
- f5 big-ip analytics12.1.0 and later · up to 12.1.4 inclusive
- f5 big-ip analytics13.0.0 and later · up to 13.1.1 inclusive
- f5 big-ip analytics14.0.0 and later · up to 14.1.0 inclusive
- f5 big-ip analytics15.0.0
- f5 big-ip application acceleration manager14.0.0 and later · up to 14.1.0 inclusive
- f5 big-ip application acceleration manager11.5.2 and later · up to 11.6.5 inclusive
- f5 big-ip application acceleration manager12.1.0 and later · up to 12.1.4 inclusive
- f5 big-ip application acceleration manager13.0.0 and later · up to 13.1.1 inclusive
- f5 big-ip application acceleration manager15.0.0
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
- BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development baffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | bind | from 9.9.0 · before 9.14.1-r0 | 9.14.1-r0 |
| Alpine:v3.6 | bind | from 9.9.0 · before 9.11.6_p1-r0 | 9.11.6_p1-r0 |
| Alpine:v3.8 | bind | from 9.9.0 · before 9.12.4_p1-r0 | 9.12.4_p1-r0 |
| Debian:12 | bind9 | before 1:9.11.5.P4+dfsg-4 | 1:9.11.5.P4+dfsg-4 |
| Debian:8 | bind9 | before 1:9.9.5.dfsg-9+deb8u18 | 1:9.9.5.dfsg-9+deb8u18 |
| Debian:9 | bind9 | before 1:9.10.3.dfsg.P4-12.3+deb9u5 | 1:9.10.3.dfsg.P4-12.3+deb9u5 |
| openSUSE:Leap 15.0 | bind | before 9.11.2-lp151.11.3.1 | 9.11.2-lp151.11.3.1 |
| openSUSE:Tumbleweed | bind | before 9.16.20-1.4 | 9.16.20-1.4 |
| Red Hat:enterprise_linux:6::client | bind | before 32:9.8.2-0.68.rc1.el6_10.3 | 32:9.8.2-0.68.rc1.el6_10.3 |
| Red Hat:enterprise_linux:6::client | bind-chroot | before 32:9.8.2-0.68.rc1.el6_10.3 | 32:9.8.2-0.68.rc1.el6_10.3 |
| Red Hat:enterprise_linux:6::client | bind-debuginfo | before 32:9.8.2-0.68.rc1.el6_10.3 | 32:9.8.2-0.68.rc1.el6_10.3 |
| Red Hat:enterprise_linux:6::client | bind-devel | before 32:9.8.2-0.68.rc1.el6_10.3 | 32:9.8.2-0.68.rc1.el6_10.3 |
| Red Hat:enterprise_linux:6::client | bind-libs | before 32:9.8.2-0.68.rc1.el6_10.3 | 32:9.8.2-0.68.rc1.el6_10.3 |
| Red Hat:enterprise_linux:6::client | bind-sdb | before 32:9.8.2-0.68.rc1.el6_10.3 | 32:9.8.2-0.68.rc1.el6_10.3 |
| Red Hat:enterprise_linux:6::client | bind-utils | before 32:9.8.2-0.68.rc1.el6_10.3 | 32:9.8.2-0.68.rc1.el6_10.3 |
| Red Hat:enterprise_linux:7::client | bind | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-chroot | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-debuginfo | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-devel | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-libs | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-libs-lite | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-license | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-lite-devel | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
| Red Hat:enterprise_linux:7::client | bind-pkcs11 | before 32:9.9.4-74.el7_6.1 | 32:9.9.4-74.el7_6.1 |
+67
Same product
f5: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-9244A BIG-IP virtual server configured with a Client SSL profile that has the non-default Session Tickets option enabled may leak up to 31 bytes52Plan
- CVE-2016-5745F5 BIG-IP LTM systems 11.x before 11.2.1 HF16, 11.3.x, 11.4.x before 11.4.1 HF11, 11.5.0, 11.5.1 before HF11, 11.5.2, 11.5.3, 11.5.4 before 40Plan
- CVE-2019-6609Platform dependent weakness.39Monitor
- CVE-2018-5506In F5 BIG-IP 13.0.0, 12.1.0-12.1.2, 11.6.1, 11.5.1-11.5.5, or 11.2.1 the Apache modules apache_auth_token_mod and mod_auth_f5_auth_token.cpp39Monitor
- CVE-2017-6131In some circumstances, an F5 BIG-IP version 12.0.0 to 12.1.2 and 13.0.0 Azure cloud instance may contain a default administrative password w39Monitor
- CVE-2019-6644Similar to the issue identified in CVE-2018-12120, on versions 14.1.0-14.1.0.5, 14.0.0-14.0.0.4, 13.0.0-13.1.2, and 12.1.0-12.1.4 BIG-IP wil37Monitor
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 |
|---|---|---|
| alpine:bind | 9.14.1-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:bind9 | 1:9.11.5.P4+dfsg-4 · Debian:12 | Package registry (OSV) |
| opensuse:bind | 9.11.2-lp151.11.3.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| red hat:bind | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-chroot | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-debuginfo | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-debugsource | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-devel | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-export-libs-debuginfo | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-libs | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-libs-debuginfo | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-libs-lite | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-libs-lite-debuginfo | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-license | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:bind-lite-devel | 32:9.11.4-17.P2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| suse:bind | 9.11.2-12.11.2 · SUSE:Linux Enterprise Module for Basesystem 15 | 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.
No commit or PR link among the references.
Credits
All researchersFinders, 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.
- 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-770 · Allocation of Resources Without Limits or ThrottlingCVSS vector
CVSS:3.1/AV:N/AC:L/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.
Attack patterns (CAPEC)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- kb.isc.org/docs/cve-2018-5743
- support.f5.com/csp/article/K74009656?utm_source=f5support&%3Butm_medium=RSS
- www.synology.com/security/advisory/Synology_SA_19_20
Vendor advisories and official records. Exploit/PoC links are deliberately left out.