CVE-2009-0126: The decrypt_public function in lib/crypt.cpp in the client in Berkeley Open Infrastructure for Network Computi

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MEDIUM 5.0DOWNGRADE

CVE-2009-0126 is a medium-severity flaw (CVSS 5.0) affecting boinc client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The decrypt_public function in lib/crypt.cpp in the client in Berkeley Open Infrastructure for Network Computing (BOINC) 6.2.14 and 6.4.5 does not check the return value from the OpenSSL RSA_public_decrypt function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-287
Published	2009-01-15
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: berkeley

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2009-01-15 17:30 UTCPublished CVE record published
2026-06-16 23:04 UTCUpdated Record last modified

berkeley boinc client DOWNGRADE

Affected: 6.2.14 · 6.4.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.2.14

1. Check installed version

apt-cache policy boinc-client || rpm -q boinc-client || boinc-client --version

2. No fixed release: DOWNGRADE to a release before 6.2.14 (Debian / Ubuntu)

apt-cache madison boinc-client sudo apt install boinc-client=<VERSION_BEFORE_6.2.14> sudo apt-mark hold boinc-client

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

dnf --showduplicates list boinc-client sudo dnf downgrade boinc-client-<VERSION_BEFORE_6.2.14> sudo dnf versionlock add boinc-client

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-2009-0126?

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

Is CVE-2009-0126 being exploited?

CVE-2009-0126 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-2009-0126 affect?

CVE-2009-0126 affects boinc client. Severity is medium (CVSS 5.0). The decrypt_public function in lib/crypt.cpp in the client in Berkeley Open Infrastructure for Network Computing (BOINC) 6.2.14 and 6.4.5 does not check the return value from the OpenSSL RSA_public_decrypt function, which allows remote atta

How urgent is CVE-2009-0126?

Priority 44/100. Public exploit reference

Software pages

OpenSSL vulnerabilities

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References

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