CVE-2020-27197: TAXII libtaxii through 1.1.117, as used in EclecticIQ OpenTAXII through 0.2.0 and other products, allows SSRF

Q: How do I fix CVE-2020-27197?

opentaxii: upgrade to newer than 0.2.0; libtaxii: upgrade to newer than 1.1.117. Exact commands for each OS are on this page.

Q: Is CVE-2020-27197 being exploited?

CVE-2020-27197 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-27197 affect?

CVE-2020-27197 affects opentaxii, libtaxii. Severity is critical (CVSS 9.8). TAXII libtaxii through 1.1.117, as used in EclecticIQ OpenTAXII through 0.2.0 and other products, allows SSRF via an initial http:// substring to the parse method, even when the no_network setting is used for the XML parser. NOTE: the vendo

Q: How urgent is CVE-2020-27197?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2020-27197 is a critical-severity flaw (CVSS 9.8) affecting opentaxii, libtaxii. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TAXII libtaxii through 1.1.117, as used in EclecticIQ OpenTAXII through 0.2.0 and other products, allows SSRF via an initial http:// substring to the parse method, even when the no_network setting is used for the XML parser. NOTE: the vendor points out that the parse method "wraps the lxml library" and that this may be an issue to "raise ... to the lxml group.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-918
Published	2020-10-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: eclecticiq · libtaxii project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-17 20:15 UTCPublished CVE record published
2026-06-17 03:08 UTCUpdated Record last modified

eclecticiq opentaxii UPGRADE

Affected: <= 0.2.0

Fixed in: newer than 0.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy opentaxii || rpm -q opentaxii || opentaxii --version

2. UPGRADE to newer than 0.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opentaxii

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opentaxii

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

libtaxii project libtaxii UPGRADE

Affected: <= 1.1.117

Fixed in: newer than 1.1.117

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libtaxii || rpm -q libtaxii || libtaxii --version

2. UPGRADE to newer than 1.1.117 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libtaxii

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libtaxii

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-27197?

opentaxii: upgrade to newer than 0.2.0; libtaxii: upgrade to newer than 1.1.117. Exact commands for each OS are on this page.

Is CVE-2020-27197 being exploited?

CVE-2020-27197 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-27197 affect?

CVE-2020-27197 affects opentaxii, libtaxii. Severity is critical (CVSS 9.8). TAXII libtaxii through 1.1.117, as used in EclecticIQ OpenTAXII through 0.2.0 and other products, allows SSRF via an initial http:// substring to the parse method, even when the no_network setting is used for the XML parser. NOTE: the vendo

How urgent is CVE-2020-27197?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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