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CVE-2017-12620· NVD / CVE Program· CNA apache

When loading models or dictionaries that contain XML it is possible to perform an XXE attack, since Apache OpenNLP is a library, this only a

When loading models or dictionaries that contain XML it is possible to perform an XXE attack, since Apache OpenNLP is a library, this only affects applications that load models or dictionaries from untrusted sources. The versions 1.5.0 to 1.5.3, 1.6.0, 1.7.0 to 1.7.2, 1.8.0 to 1.8.1 of Apache OpenNLP are affected.

CriticalCVSS 9.8 · v3.0—No exploit Fix available
Published
Oct 2, 2017
Updated
Jun 16, 2026
EPSS
3.0% · 87th percentile
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Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.0%

Affected systems

VendorProduct
apacheopennlp

Affected versions

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

  • apache opennlp1.5.0
  • apache opennlp1.5.1
  • apache opennlp1.5.2
  • apache opennlp1.5.3
  • apache opennlp1.6.0
  • apache opennlp1.7.0
  • apache opennlp1.7.1
  • apache opennlp1.7.2
  • apache opennlp1.8.0
  • apache opennlp1.8.1

Versions reported by the vendor

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

  • Apache Software Foundation Apache OpenNLP

    • 1.5.0 to 1.5.3, 1.6.0, 1.7.0 to 1.7.2, 1.8.0 to 1.8.1affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Mavenorg.apache.opennlp:opennlp-toolsfrom 1.5.0 · before 1.8.21.8.2
openSUSE:Tumbleweedopennlpbefore 1.9.5-1.11.9.5-1.1

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-82617Apache OpenNLP, Apache OpenNLP: ReDoS / stack exhaustion in RegexNameFinderFactory built-in EMAIL and URL patterns
    40Plan
  • CVE-2026-42027Apache OpenNLP: Arbitrary Class Instantiation via Model Manifest in ExtensionLoader
    39Monitor
  • CVE-2026-40682Apache OpenNLP: XXE via Dictionary Parsing in DictionaryEntryPersistor
    36Monitor
  • CVE-2026-43825Apache OpenNLP :: Core :: ML :: LibSVM: Unsafe Java Deserialization in SvmDoccatModel
    33Monitor
  • CVE-2026-67211Apache OpenNLP: OOM DoS via Unbounded Array Allocation in SymSpellModelSerializer
    30Monitor
  • CVE-2026-42440Apache OpenNLP: OOM DoS via Unbounded Array Allocation in AbstractModelReader
    30Monitor

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
Maven:org.apache.opennlp:opennlp-tools1.8.2Package registry (OSV)
opensuse:opennlp1.9.5-1.1 · openSUSE:TumbleweedPackage 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.

No credits in the CNA record.

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-611 · Improper Restriction of XML External Entity Reference

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

—

Noroxi analysis

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Change log

  1. Fix✗ → ✓

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