CVE-2016-6129: The rsa_verify_hash_ex function in rsa_verify_hash.c in LibTomCrypt, as used in OP-TEE before 2.2.0, does not

Q: How do I fix CVE-2016-6129?

op-tee: upgrade to 2.2.0; libtomcrypt: upgrade to newer than 1.17. Exact commands for each OS are on this page.

Q: Is CVE-2016-6129 being exploited?

CVE-2016-6129 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-2016-6129 affect?

CVE-2016-6129 affects op-tee, libtomcrypt. Severity is high (CVSS 7.5). The rsa_verify_hash_ex function in rsa_verify_hash.c in LibTomCrypt, as used in OP-TEE before 2.2.0, does not validate that the message length is equal to the ASN.1 encoded data length, which makes it easier for remote attackers to forge RS

Q: How urgent is CVE-2016-6129?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2016-6129 is a high-severity flaw (CVSS 7.5) affecting op-tee, libtomcrypt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The rsa_verify_hash_ex function in rsa_verify_hash.c in LibTomCrypt, as used in OP-TEE before 2.2.0, does not validate that the message length is equal to the ASN.1 encoded data length, which makes it easier for remote attackers to forge RSA signatures or public certificates by leveraging a Bleichenbacher signature forgery attack.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-20
Published	2017-02-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libtom · trustedfirmware

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

Am I affected?

Timeline

2017-02-13 18:59 UTCPublished CVE record published
2026-06-17 00:50 UTCUpdated Record last modified

trustedfirmware op-tee UPGRADE

Affected: < 2.2.0

Fixed in: 2.2.0

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

libtom libtomcrypt UPGRADE

Affected: <= 1.17

Fixed in: newer than 1.17

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.17 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libtomcrypt

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-2016-6129?

op-tee: upgrade to 2.2.0; libtomcrypt: upgrade to newer than 1.17. Exact commands for each OS are on this page.

Is CVE-2016-6129 being exploited?

CVE-2016-6129 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-2016-6129 affect?

CVE-2016-6129 affects op-tee, libtomcrypt. Severity is high (CVSS 7.5). The rsa_verify_hash_ex function in rsa_verify_hash.c in LibTomCrypt, as used in OP-TEE before 2.2.0, does not validate that the message length is equal to the ASN.1 encoded data length, which makes it easier for remote attackers to forge RS

How urgent is CVE-2016-6129?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

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References

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