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CVE-2009-0654

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an...

5.1 Medium

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Exploit likelihood

2.39%Up 1.3 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 5.1

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Record
CVE-2009-0654
CVSS 2.0
5.1 MediumAV:N/AC:H/Au:N/C:P/I:P/A:P
Updated
2026-11-02
CVE List No score

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Record
CVE-2009-0654
Updated
2026-11-02
EUVDEUVD-2009-0657 No score

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Record
EUVD-2009-0657
Updated
2026-11-03
GitHub AdvisoriesGHSA-39qj-vvc5-79wf No score

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an...

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Record
GHSA-39qj-vvc5-79wf
Updated
2026-11-02
OSV No score

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Record
CVE-2009-0654
Updated
2026-11-02
OSVDEBIAN-CVE-2009-0654 No score

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Record
DEBIAN-CVE-2009-0654
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tor
Debian:12
All versions, plus listed versions
0.4.7.13-10.4.7.16-10.4.8.10-10.4.8.10-1~bpo11+10.4.8.10-1~bpo12+1
Show 45 moreShow less
0.4.8.11-10.4.8.11-1~bpo11+10.4.8.11-1~bpo12+10.4.8.12-10.4.8.12-1.10.4.8.12-1~bpo11+10.4.8.12-1~bpo12+10.4.8.13-10.4.8.13-20.4.8.13-2~bpo12+10.4.8.14-10.4.8.14-1~bpo12+10.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+20.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.8.4-20.4.8.5-10.4.8.6-10.4.8.7-10.4.8.8-10.4.8.9-10.4.8.9-1~bpo11+10.4.8.9-1~bpo12+10.4.9.11-0+deb12u10.4.9.11-10.4.9.11-1~bpo13+10.4.9.12-20.4.9.12-30.4.9.12-40.4.9.13-10.4.9.14-10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+10.4.9.6-0+deb12u10.4.9.6-10.4.9.6-1~bpo12+10.4.9.6-1~bpo13+10.4.9.8-0+deb12u1
None known
tor
Debian:13
All versions, plus listed versions
0.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+2
Show 29 moreShow less
0.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.9.11-0+deb13u10.4.9.11-10.4.9.11-1~bpo13+10.4.9.12-0+deb13u10.4.9.12-0+deb13u20.4.9.12-20.4.9.12-30.4.9.12-40.4.9.13-0+deb13u10.4.9.13-10.4.9.14-0+deb13u10.4.9.14-10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+10.4.9.6-0+deb13u10.4.9.6-10.4.9.6-1~bpo12+10.4.9.6-1~bpo13+10.4.9.8-0+deb13u10.4.9.8-10.4.9.8-1~bpo12+10.4.9.8-1~bpo13+10.4.9.9-10.4.9.9-1~bpo13+1
None known
tor
Debian:14
All versions, plus listed versions
0.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+2
Show 22 moreShow less
0.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.9.11-10.4.9.11-1~bpo13+10.4.9.12-20.4.9.12-30.4.9.12-40.4.9.13-10.4.9.14-10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+10.4.9.6-10.4.9.6-1~bpo12+10.4.9.6-1~bpo13+10.4.9.8-10.4.9.8-1~bpo12+10.4.9.8-1~bpo13+10.4.9.9-10.4.9.9-1~bpo13+1
None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-0654 is a medium vulnerability (CVSS 5.1) in Tor, published February 20, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.39%, the 84th percentile. No source names a fixed version.

References

This page doesn't list everything

Left out here: 5 versions. The JSON record has them.

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