CVE-2017-0907: The Recurly Client .NET Library before 1.0.1, 1.1.10, 1.2.8, 1.3.2, 1.4.14, 1.5.3, 1.6.2, 1.7.1, 1.8.1 is vuln

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2017-0907 is a critical-severity flaw (CVSS 9.8) affecting recurly client .net. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Recurly Client .NET Library before 1.0.1, 1.1.10, 1.2.8, 1.3.2, 1.4.14, 1.5.3, 1.6.2, 1.7.1, 1.8.1 is vulnerable to a Server-Side Request Forgery vulnerability due to incorrect use of "Uri.EscapeUriString" that could result in compromise of API keys or other critical resources.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-918
Published	2017-11-13
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: recurly

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

Am I affected?

Timeline

2017-11-13 17:29 UTCPublished CVE record published
2026-06-17 00:58 UTCUpdated Record last modified

recurly recurly client .net DOWNGRADE

Affected: 1.0.0 · 1.0.0 beta1 · 1.0.0 beta2 · 1.0.0 beta3 · 1.0.0 rc1 · 1.0.0.1 · 1.0.0.2 · 1.0.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy recurly-client-.net || rpm -q recurly-client-.net || recurly-client-.net --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison recurly-client-.net sudo apt install recurly-client-.net=<VERSION_BEFORE_1.0.0> sudo apt-mark hold recurly-client-.net

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list recurly-client-.net sudo dnf downgrade recurly-client-.net-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add recurly-client-.net

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2017-0907?

recurly client .net: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-0907 being exploited?

CVE-2017-0907 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-2017-0907 affect?

CVE-2017-0907 affects recurly client .net. Severity is critical (CVSS 9.8). The Recurly Client .NET Library before 1.0.1, 1.1.10, 1.2.8, 1.3.2, 1.4.14, 1.5.3, 1.6.2, 1.7.1, 1.8.1 is vulnerable to a Server-Side Request Forgery vulnerability due to incorrect use of "Uri.EscapeUriString" that could result in compromis

How urgent is CVE-2017-0907?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

References

← Back to latest CVEs