Predictable from Observable State
CWE-341
A number or object is predictable based on observations that the attacker can make about the state of the system or network, such as time, process ID, etc.
We track 9 vulnerabilities of this type. 100% are rated high or critical, and the average CVSS score is 8.2.
How this weakness is prevented
- Implementation: Increase the entropy used to seed a PRNG.
- Architecture and Design Requirements: Use products or modules that conform to FIPS 140-2 to avoid obvious entropy problems. Consult FIPS 140-2 Annex C (Approved Random Number Generators).
- Implementation: Use a PRNG that periodically re-seeds itself using input from high-quality sources, such as hardware devices with high entropy. However, do not re-seed too frequently, or else the entropy source might block.
Latest Predictable from Observable State vulnerabilities
- 9.1 Critical severity
postiz-app: Use of Insufficiently Random Values
Postiz generates security-sensitive credentials using `Math.random()` instead of a cryptographically secure source. The same helper is used for OAuth access tokens, authorization codes, client secrets, organization API keys, and PKCE verifiers, meaning these c
- 7.3 High severity
Red Hat build of Keycloak 26.6: Predictable from Observable State
A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that
- 9.8 Critical severity
Ntopng: Predictable from Observable State
ntopng through 6.6 is vulnerable to Predictable Session Identifier which can lead to Session Hijacking. HTTP session identifiers in src/HTTPserver.cpp use weak time-seeded pseudo-randomness during session creation. As a result, fresh authenticated logins can r
- 8.2 High severity
Apache::Session::Generate::ModUniqueId: Generation of Predictable Numbers or Identifiers
Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure. Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID vari
- 7.5 High severity
GV-LPC2011/LPC2211: Predictable from Observable State
A guessable session cookie vulnerability exists in the Web Interface functionality of GeoVision LPC2011/LPC2211 1.10. A specially crafted series of HTTP requests can lead to an authentication bypas. An attacker can bruteforce session cookies to trigger this vu
- 7.5 High severity
jq: Use of Weak Hash
jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisi
- 8.6 High severity
BIND 9: Predictable from Observable State
In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use. This issue affects BIND 9 versions 9.16.0 through 9.16.50, 9.18.0
- 8.1 High severity
COCO Annotator: Predictable from Observable State
A vulnerability, which was classified as problematic, was found in jsbroks COCO Annotator 0.11.1. This affects an unknown part of the component Session Handler. The manipulation of the argument SECRET_KEY leads to predictable from observable state. It is possi
- 7.5 High severity
H8951-4G-ESP: Use of a Broken or Risky Cryptographic Algorithm
The authentication cookies are generated using an algorithm based on the username, hardcoded secret and the up-time, and can be guessed in a reasonable time.