How severe is CVE-2012-5573?

CVE-2012-5573 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2012-5573 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-5573?

CVE-2012-5573 primarily affects Torproject Tor. In total, 99 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-5573?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-5573 published?

CVE-2012-5573 was published on 2013-01-01 and last updated on 2026-06-16.

CVE-2012-5573

CVE-2012-5573 is a medium-severity vulnerability in Torproject Tor with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Torproject Tor
Published: 2013-01-01
Last modified: 2026-06-16

Description

The connection_edge_process_relay_cell function in or/relay.c in Tor before 0.2.3.25 maintains circuits even if an unexpected SENDME cell arrives, which might allow remote attackers to cause a denial of service (memory consumption or excessive cell reception rate) or bypass intended flow-control restrictions via a RELAY_COMMAND_SENDME command.

Frequently asked questions

What is CVE-2012-5573?: The connection_edge_process_relay_cell function in or/relay.c in Tor before 0.2.3.25 maintains circuits even if an unexpected SENDME cell arrives, which might allow remote attackers to cause a denial of service (memory consumption or excessive cell reception rate) or bypass intended flow-control restrictions via a RELAY_COMMAND_SENDME command.
How severe is CVE-2012-5573?: CVE-2012-5573 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2012-5573 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-5573?: CVE-2012-5573 primarily affects Torproject Tor. In total, 99 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-5573?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-5573 published?: CVE-2012-5573 was published on 2013-01-01 and last updated on 2026-06-16.

References

Affected products (99)

cpe:2.3:a:torproject:tor:*:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre13:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre14:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre15:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre16:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre17:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre18:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre19:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre20:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre21:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre22:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre23:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre24:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre25:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre26:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.2:pre27:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.3:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.4:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.5:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.6:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.6.1:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.6.2:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.7:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.7.1:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.7.2:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.7.3:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.8.1:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.1:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.2:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.3:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.4:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.5:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.6:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.7:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.8:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.9:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.0.9.10:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.1.0.10:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.1.0.11:*:*:*:*:*:*:*

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