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NVD / CVE Program· CNA f5

CVE-2020-27725: In version 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2 of BIG-IP DNS, GTM, and Link Controller…

MediumCVSS 4.3 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 17/100)

  • 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: 0.80% (FIRST EPSS); higher than 57% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

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

In version 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2 of BIG-IP DNS, GTM, and Link Controller, zxfrd leaks memory when listing DNS zones. Zones can be listed via TMSH, iControl or SNMP; only users with access to those services can trigger this vulnerability.

Published
Dec 24, 2020
Updated
Jun 16, 2026
EPSS
0.8% · 57th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-27725

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
f5big-ip domain name system
f5big-ip global traffic manager
f5big-ip link controller

Versions reported by the vendor

Affected version ranges reported by the assigning authority (f5). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a BIG-IP DNS, GTM, and Link Controller

    • 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, 11.6.1-11.6.5.2affected
Affected versions · NVD (15)

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

  • f5 big-ip domain name system11.6.1 and later · up to 11.6.5 inclusive
  • f5 big-ip domain name system12.1.0 and later · up to 12.1.5 inclusive
  • f5 big-ip domain name system13.1.0 and later · before 13.1.3.5
  • f5 big-ip domain name system14.1.0 and later · before 14.1.3.1
  • f5 big-ip domain name system15.0.0 and later · before 15.1.1
  • f5 big-ip global traffic manager11.6.1 and later · up to 11.6.5 inclusive
  • f5 big-ip global traffic manager12.1.0 and later · up to 12.1.5 inclusive
  • f5 big-ip global traffic manager13.1.0 and later · before 13.1.3.5
  • f5 big-ip global traffic manager14.1.0 and later · before 14.1.3.1
  • f5 big-ip global traffic manager15.0.0 and later · before 15.1.1
  • f5 big-ip link controller11.6.1 and later · up to 11.6.5 inclusive
  • f5 big-ip link controller12.1.0 and later · up to 12.1.5 inclusive
  • f5 big-ip link controller13.1.0 and later · before 13.1.3.5
  • f5 big-ip link controller14.1.0 and later · before 14.1.3.1
  • f5 big-ip link controller15.0.0 and later · before 15.1.1

Same product

f5: all records

Other highest-scoring records for the same primary product.

  • CVE-2015-8611BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, DNS, Link Controller, and PEM 12.0.0 before HF1 on the 2000, 4000, 5000, 7000, and 10000…
    40Plan
  • CVE-2023-28742BIG-IP iQuery mesh vulnerability
    35Monitor
  • CVE-2022-23013On BIG-IP DNS & GTM version 16.x before 16.1.0, 15.1.x before 15.1.4, 14.1.x before 14.1.4.4, and all versions of 13.1.x, 12.1.x, and…
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2018-5538Jul 25, 2018 · On F5 BIG-IP DNS 13.1.0-13.1.0.7, 12.1.3-12.1.3.5, DNS Express / DNS Zones accept NOTIFY messages on the management interface from source…
    14Monitor
  • ← EarlierCVE-2020-27721Dec 24, 2020 · In versions 16.0.0-16.0.0.1, 15.1.0-15.1.1, 14.1.0-14.1.3, 13.1.0-13.1.3.5, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, in a BIG-IP DNS / BIG-IP…
    30Monitor
  • Later →CVE-2020-27717Dec 24, 2020 · On BIG-IP DNS 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, and 12.1.0-12.1.5.2, undisclosed series of DNS requests may…
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

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

All records